diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61dbef4..44a7302 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](http://semver.org).
 
+## 5.0.5 - 2018-03-28
+
+* Fix: allow empty values `Disallow` directive (according [official spec](http://www.robotstxt.org/orig.html)).
+* Fix: don't generate empty `Clean-param`.
+
 ## 5.0.4 - 2018-01-16
 
 * Fix: typo in source code message errors.
diff --git a/package-lock.json b/package-lock.json
index 925e153..2f211b4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "generate-robotstxt",
-  "version": "5.0.4",
+  "version": "5.0.5",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -71,6 +71,147 @@
         "slide": "1.1.6"
       }
     },
+    "@babel/code-frame": {
+      "version": "7.0.0-beta.42",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0-beta.42.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/highlight": "7.0.0-beta.42"
+      }
+    },
+    "@babel/generator": {
+      "version": "7.0.0-beta.42",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.42.tgz",
+      "integrity": "sha512-9x3zS4nG/6GAvJWB8fAK+5g/Di36xdubB43dMNSucNJTwPvmyfCippir/0I8zyG+ID66hLCLi8V9bomlWRYaHA==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "7.0.0-beta.42",
+        "jsesc": "2.5.1",
+        "lodash": "4.17.5",
+        "source-map": "0.5.7",
+        "trim-right": "1.0.1"
+      },
+      "dependencies": {
+        "jsesc": {
+          "version": "2.5.1",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.1.tgz",
+          "integrity": "sha1-5CGiqOINawgZ3yiQj3glJrlt0f4=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-function-name": {
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+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.42.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "7.0.0-beta.42",
+        "@babel/template": "7.0.0-beta.42",
+        "@babel/types": "7.0.0-beta.42"
+      }
+    },
+    "@babel/helper-get-function-arity": {
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+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.42.tgz",
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+      "dev": true,
+      "requires": {
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+      }
+    },
+    "@babel/helper-split-export-declaration": {
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+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0-beta.42.tgz",
+      "integrity": "sha512-2r8pZG6SAJTTaI2OhxCmz5PKlMUPY5adOHrHtb1gM3ibJPDOzPAeOQNzItdxNnM33jjRakEGitXX6iYg7Sz73w==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "7.0.0-beta.42"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.0.0-beta.42",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0-beta.42.tgz",
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+      "dev": true,
+      "requires": {
+        "chalk": "2.3.2",
+        "esutils": "2.0.2",
+        "js-tokens": "3.0.2"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.0.0-beta.42.tgz",
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+        "@babel/types": "7.0.0-beta.42",
+        "babylon": "7.0.0-beta.42",
+        "lodash": "4.17.5"
+      },
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+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-7.0.0-beta.42.tgz",
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+          "dev": true
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+      "dev": true,
+      "requires": {
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+        "@babel/generator": "7.0.0-beta.42",
+        "@babel/helper-function-name": "7.0.0-beta.42",
+        "@babel/helper-split-export-declaration": "7.0.0-beta.42",
+        "@babel/types": "7.0.0-beta.42",
+        "babylon": "7.0.0-beta.42",
+        "debug": "3.1.0",
+        "globals": "11.4.0",
+        "invariant": "2.2.4",
+        "lodash": "4.17.5"
+      },
+      "dependencies": {
+        "babylon": {
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+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-7.0.0-beta.42.tgz",
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+          "dev": true
+        },
+        "globals": {
+          "version": "11.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-11.4.0.tgz",
+          "integrity": "sha512-Dyzmifil8n/TmSqYDEXbm+C8yitzJQqQIlJQLNRMwa+BOUJpRC19pyVeN12JAjt61xonvXjtff+hJruTRXn5HA==",
+          "dev": true
+        }
+      }
+    },
+    "@babel/types": {
+      "version": "7.0.0-beta.42",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.0.0-beta.42.tgz",
+      "integrity": "sha512-+pmpISmTHQqMMpHHtDLxcvtRhmn53bAxy8goJfHipS/uy/r3PLcuSdPizLW7DhtBWbtgIKZufLObfnIMoyMNsw==",
+      "dev": true,
+      "requires": {
+        "esutils": "2.0.2",
+        "lodash": "4.17.5",
+        "to-fast-properties": "2.0.0"
+      },
+      "dependencies": {
+        "to-fast-properties": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+          "dev": true
+        }
+      }
+    },
     "@concordance/react": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/@concordance/react/-/react-1.0.0.tgz",
@@ -165,12 +306,27 @@
         }
       }
     },
+    "abab": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/abab/-/abab-1.0.4.tgz",
+      "integrity": "sha1-X6rZwsB/YN12dw9xzwJbYqY8/U4=",
+      "dev": true
+    },
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-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.4.1.tgz",
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+      "version": "5.5.3",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.5.3.tgz",
+      "integrity": "sha512-jd5MkIUlbbmb07nXH0DT3y7rDVtkzDi4XZOUVWAer8ajmF/DTSSbl5oNFyDOl/OXA33Bl79+ypHhl2pN20VeOQ==",
       "dev": true
     },
+    "acorn-globals": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-4.1.0.tgz",
+      "integrity": "sha512-KjZwU26uG3u6eZcfGbTULzFcsoz6pegNKtHPksZPOUsiKo5bUmiBPa38FuHZ/Eun+XYh/JCCkS9AS3Lu4McQOQ==",
+      "dev": true,
+      "requires": {
+        "acorn": "5.5.3"
+      }
+    },
     "acorn-jsx": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
@@ -213,7 +369,7 @@
       "dev": true,
       "requires": {
         "co": "4.6.0",
-        "fast-deep-equal": "1.0.0",
+        "fast-deep-equal": "1.1.0",
         "fast-json-stable-stringify": "2.0.0",
         "json-schema-traverse": "0.3.1"
       }
@@ -234,9 +390,9 @@
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-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.0.0.tgz",
-      "integrity": "sha512-O/klc27mWNUigtv0F8NJWbLF00OcegQalkqKURWdosW08YZKi4m6CnSUSvIZG1otNJbTWhN01Hhz389DW7mvDQ==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
+      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
       "dev": true
     },
     "ansi-regex": {
@@ -246,9 +402,9 @@
       "dev": true
     },
     "ansi-styles": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.0.tgz",
-      "integrity": "sha512-NnSOmMEYtVR2JVMIGTzynRkkaxtiq1xnFBcdQD/DnNCYPoEPsVJhM98BDyaoNOQIi7p4okdi3E27eN7GQbsUug==",
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
       "dev": true,
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@@ -291,7 +447,7 @@
       "dev": true,
       "requires": {
         "ast-types-flow": "0.0.7",
-        "commander": "2.14.1"
+        "commander": "2.15.1"
       }
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@@ -315,12 +471,24 @@
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       "dev": true
     },
+    "arr-union": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
+      "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-1.0.0.tgz",
       "integrity": "sha1-7/UuN1gknTO+QCuLuOVkuytdQDE=",
       "dev": true
     },
+    "array-equal": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz",
+      "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
+      "dev": true
+    },
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@@ -339,7 +507,7 @@
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       "requires": {
         "define-properties": "1.1.2",
-        "es-abstract": "1.10.0"
+        "es-abstract": "1.11.0"
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@@ -392,6 +560,24 @@
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       "dev": true
     },
+    "asn1": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
+      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y=",
+      "dev": true
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "dev": true
+    },
+    "assign-symbols": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
+      "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
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@@ -404,6 +590,24 @@
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       "dev": true
     },
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+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
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+      "dev": true
+    },
+    "asynckit": {
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+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true
+    },
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+      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.0.tgz",
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@@ -421,8 +625,8 @@
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-        "ansi-escapes": "3.0.0",
-        "ansi-styles": "3.2.0",
+        "ansi-escapes": "3.1.0",
+        "ansi-styles": "3.2.1",
         "arr-flatten": "1.1.0",
         "array-union": "1.0.2",
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@@ -434,7 +638,7 @@
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         "bluebird": "3.5.1",
         "caching-transform": "1.0.1",
-        "chalk": "2.3.1",
+        "chalk": "2.3.2",
         "chokidar": "1.7.0",
         "clean-stack": "1.3.0",
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@@ -490,15 +694,15 @@
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         "semver": "5.5.0",
         "slash": "1.0.0",
-        "source-map-support": "0.5.3",
+        "source-map-support": "0.5.4",
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         "strip-ansi": "4.0.0",
         "strip-bom-buf": "1.0.0",
         "supertap": "1.0.0",
-        "supports-color": "5.2.0",
+        "supports-color": "5.3.0",
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-        "update-notifier": "2.3.0"
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@@ -769,6 +973,18 @@
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+    "aws-sign2": {
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+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+      "dev": true
+    },
+    "aws4": {
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+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.6.0.tgz",
+      "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4=",
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@@ -892,6 +1108,28 @@
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+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "7.0.0-beta.42",
+        "@babel/traverse": "7.0.0-beta.42",
+        "@babel/types": "7.0.0-beta.42",
+        "babylon": "7.0.0-beta.42",
+        "eslint-scope": "3.7.1",
+        "eslint-visitor-keys": "1.0.0"
+      },
+      "dependencies": {
+        "babylon": {
+          "version": "7.0.0-beta.42",
+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-7.0.0-beta.42.tgz",
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+          "dev": true
+        }
+      }
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-        "core-js": "2.5.3",
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@@ -1392,7 +1630,7 @@
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@@ -1438,7 +1676,7 @@
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@@ -6160,6 +7685,11 @@
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@@ -6328,6 +7920,83 @@
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@@ -6352,11 +8021,25 @@
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@@ -6399,6 +8087,11 @@
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@@ -6475,6 +8184,25 @@
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@@ -6540,6 +8268,14 @@
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@@ -6555,6 +8291,11 @@
           "bundled": true,
           "dev": true
         },
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           "version": "7.1.2",
           "bundled": true,
@@ -6629,8 +8370,62 @@
           "bundled": true,
           "dev": true
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+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "get-value": "2.0.6",
+            "has-values": "1.0.0",
+            "isobject": "3.0.1"
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+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            }
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+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "is-number": "3.0.0",
+            "kind-of": "4.0.0"
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+              "bundled": true,
+              "dev": true,
+              "requires": {
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+              },
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+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
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+                  }
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+              "bundled": true,
+              "dev": true,
+              "requires": {
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+              }
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+          "version": "2.6.0",
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@@ -6654,7 +8449,7 @@
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-          "version": "2.2.2",
+          "version": "2.2.3",
           "bundled": true,
           "dev": true,
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@@ -6666,6 +8461,21 @@
           "bundled": true,
           "dev": true
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+          "bundled": true,
+          "dev": true,
+          "requires": {
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+              "bundled": true,
+              "dev": true
+            }
+          }
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           "bundled": true,
@@ -6684,6 +8494,38 @@
             "builtin-modules": "1.1.1"
           }
         },
+        "is-data-descriptor": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "kind-of": "6.0.2"
+          },
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+            "kind-of": {
+              "version": "6.0.2",
+              "bundled": true,
+              "dev": true
+            }
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+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true,
+          "requires": {
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+            "is-data-descriptor": "1.0.0",
+            "kind-of": "6.0.2"
+          },
+          "dependencies": {
+            "kind-of": {
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+              "bundled": true,
+              "dev": true
+            }
+          }
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@@ -6716,12 +8558,9 @@
           }
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         "is-fullwidth-code-point": {
-          "version": "1.0.0",
+          "version": "2.0.0",
           "bundled": true,
-          "dev": true,
-          "requires": {
-            "number-is-nan": "1.0.1"
-          }
+          "dev": true
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           "version": "2.0.1",
@@ -6739,6 +8578,36 @@
             "kind-of": "3.2.2"
           }
         },
+        "is-odd": {
+          "version": "2.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "is-number": "4.0.0"
+          },
+          "dependencies": {
+            "is-number": {
+              "version": "4.0.0",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
+        "is-plain-object": {
+          "version": "2.0.4",
+          "bundled": true,
+          "dev": true,
+          "requires": {
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+          },
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+            "isobject": {
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+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
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           "version": "0.1.1",
           "bundled": true,
@@ -6759,6 +8628,11 @@
           "bundled": true,
           "dev": true
         },
+        "is-windows": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true
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@@ -6778,7 +8652,7 @@
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-          "version": "1.1.1",
+          "version": "1.2.0",
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@@ -6791,25 +8665,25 @@
           }
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-          "version": "1.9.1",
+          "version": "1.10.1",
           "bundled": true,
           "dev": true,
           "requires": {
-            "babel-generator": "6.26.0",
+            "babel-generator": "6.26.1",
             "babel-template": "6.26.0",
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             "babel-types": "6.26.0",
             "babylon": "6.18.0",
-            "istanbul-lib-coverage": "1.1.1",
-            "semver": "5.4.1"
+            "istanbul-lib-coverage": "1.2.0",
+            "semver": "5.5.0"
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         "istanbul-lib-report": {
-          "version": "1.1.2",
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           "bundled": true,
           "dev": true,
           "requires": {
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@@ -6826,12 +8700,12 @@
           }
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         "istanbul-lib-source-maps": {
-          "version": "1.2.2",
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           "bundled": true,
           "dev": true,
           "requires": {
             "debug": "3.1.0",
-            "istanbul-lib-coverage": "1.1.1",
+            "istanbul-lib-coverage": "1.2.0",
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@@ -6848,7 +8722,7 @@
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@@ -6916,7 +8790,7 @@
           }
         },
         "lodash": {
-          "version": "4.17.4",
+          "version": "4.17.5",
           "bundled": true,
           "dev": true
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@@ -6934,7 +8808,7 @@
           }
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-          "version": "4.1.1",
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           "bundled": true,
           "dev": true,
           "requires": {
@@ -6942,6 +8816,19 @@
             "yallist": "2.1.2"
           }
         },
+        "map-cache": {
+          "version": "0.2.2",
+          "bundled": true,
+          "dev": true
+        },
+        "map-visit": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
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+          }
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@@ -6960,15 +8847,22 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "mimic-fn": "1.1.0"
+            "mimic-fn": "1.2.0"
           }
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         "merge-source-map": {
-          "version": "1.0.4",
+          "version": "1.1.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "source-map": "0.5.7"
+            "source-map": "0.6.1"
+          },
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+            "source-map": {
+              "version": "0.6.1",
+              "bundled": true,
+              "dev": true
+            }
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         "micromatch": {
@@ -6992,7 +8886,7 @@
           }
         },
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-          "version": "1.1.0",
+          "version": "1.2.0",
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           "dev": true
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@@ -7001,7 +8895,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "brace-expansion": "1.1.8"
+            "brace-expansion": "1.1.11"
           }
         },
         "minimist": {
@@ -7009,6 +8903,25 @@
           "bundled": true,
           "dev": true
         },
+        "mixin-deep": {
+          "version": "1.3.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "for-in": "1.0.2",
+            "is-extendable": "1.0.1"
+          },
+          "dependencies": {
+            "is-extendable": {
+              "version": "1.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
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+              }
+            }
+          }
+        },
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
@@ -7022,15 +8935,51 @@
           "bundled": true,
           "dev": true
         },
+        "nanomatch": {
+          "version": "1.2.9",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "arr-diff": "4.0.0",
+            "array-unique": "0.3.2",
+            "define-property": "2.0.2",
+            "extend-shallow": "3.0.2",
+            "fragment-cache": "0.2.1",
+            "is-odd": "2.0.0",
+            "is-windows": "1.0.2",
+            "kind-of": "6.0.2",
+            "object.pick": "1.3.0",
+            "regex-not": "1.0.2",
+            "snapdragon": "0.8.2",
+            "to-regex": "3.0.2"
+          },
+          "dependencies": {
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+              "version": "4.0.0",
+              "bundled": true,
+              "dev": true
+            },
+            "array-unique": {
+              "version": "0.3.2",
+              "bundled": true,
+              "dev": true
+            },
+            "kind-of": {
+              "version": "6.0.2",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "normalize-package-data": {
           "version": "2.4.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "hosted-git-info": "2.5.0",
+            "hosted-git-info": "2.6.0",
             "is-builtin-module": "1.0.0",
-            "semver": "5.4.1",
-            "validate-npm-package-license": "3.0.1"
+            "semver": "5.5.0",
+            "validate-npm-package-license": "3.0.3"
           }
         },
         "normalize-path": {
@@ -7059,6 +9008,74 @@
           "bundled": true,
           "dev": true
         },
+        "object-copy": {
+          "version": "0.1.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
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+            "define-property": "0.2.5",
+            "kind-of": "3.2.2"
+          },
+          "dependencies": {
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+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-descriptor": "0.1.6"
+              }
+            },
+            "is-accessor-descriptor": {
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+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              }
+            },
+            "is-data-descriptor": {
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+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              }
+            },
+            "is-descriptor": {
+              "version": "0.1.6",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-accessor-descriptor": "0.1.6",
+                "is-data-descriptor": "0.1.4",
+                "kind-of": "5.1.0"
+              },
+              "dependencies": {
+                "kind-of": {
+                  "version": "5.1.0",
+                  "bundled": true,
+                  "dev": true
+                }
+              }
+            }
+          }
+        },
+        "object-visit": {
+          "version": "1.0.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "isobject": "3.0.1"
+          },
+          "dependencies": {
+            "isobject": {
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+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "object.omit": {
           "version": "2.0.1",
           "bundled": true,
@@ -7068,6 +9085,21 @@
             "is-extendable": "0.1.1"
           }
         },
+        "object.pick": {
+          "version": "1.3.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "isobject": "3.0.1"
+          },
+          "dependencies": {
+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
         "once": {
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           "bundled": true,
@@ -7106,18 +9138,26 @@
           "dev": true
         },
         "p-limit": {
-          "version": "1.1.0",
+          "version": "1.2.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "requires": {
+            "p-try": "1.0.0"
+          }
         },
         "p-locate": {
           "version": "2.0.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "p-limit": "1.1.0"
+            "p-limit": "1.2.0"
           }
         },
+        "p-try": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true
+        },
         "parse-glob": {
           "version": "3.0.4",
           "bundled": true,
@@ -7137,6 +9177,11 @@
             "error-ex": "1.3.1"
           }
         },
+        "pascalcase": {
+          "version": "0.1.1",
+          "bundled": true,
+          "dev": true
+        },
         "path-exists": {
           "version": "2.1.0",
           "bundled": true,
@@ -7207,8 +9252,13 @@
             }
           }
         },
-        "preserve": {
-          "version": "0.2.0",
+        "posix-character-classes": {
+          "version": "0.1.1",
+          "bundled": true,
+          "dev": true
+        },
+        "preserve": {
+          "version": "0.2.0",
           "bundled": true,
           "dev": true
         },
@@ -7297,6 +9347,15 @@
             "is-equal-shallow": "0.1.3"
           }
         },
+        "regex-not": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "extend-shallow": "3.0.2",
+            "safe-regex": "1.1.0"
+          }
+        },
         "remove-trailing-separator": {
           "version": "1.1.0",
           "bundled": true,
@@ -7335,6 +9394,16 @@
           "bundled": true,
           "dev": true
         },
+        "resolve-url": {
+          "version": "0.2.1",
+          "bundled": true,
+          "dev": true
+        },
+        "ret": {
+          "version": "0.1.15",
+          "bundled": true,
+          "dev": true
+        },
         "right-align": {
           "version": "0.1.3",
           "bundled": true,
@@ -7352,8 +9421,16 @@
             "glob": "7.1.2"
           }
         },
+        "safe-regex": {
+          "version": "1.1.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "ret": "0.1.15"
+          }
+        },
         "semver": {
-          "version": "5.4.1",
+          "version": "5.5.0",
           "bundled": true,
           "dev": true
         },
@@ -7362,6 +9439,27 @@
           "bundled": true,
           "dev": true
         },
+        "set-value": {
+          "version": "2.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "extend-shallow": "2.0.1",
+            "is-extendable": "0.1.1",
+            "is-plain-object": "2.0.4",
+            "split-string": "3.1.0"
+          },
+          "dependencies": {
+            "extend-shallow": {
+              "version": "2.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-extendable": "0.1.1"
+              }
+            }
+          }
+        },
         "shebang-command": {
           "version": "1.2.0",
           "bundled": true,
@@ -7385,11 +9483,145 @@
           "bundled": true,
           "dev": true
         },
+        "snapdragon": {
+          "version": "0.8.2",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "base": "0.11.2",
+            "debug": "2.6.9",
+            "define-property": "0.2.5",
+            "extend-shallow": "2.0.1",
+            "map-cache": "0.2.2",
+            "source-map": "0.5.7",
+            "source-map-resolve": "0.5.1",
+            "use": "3.1.0"
+          },
+          "dependencies": {
+            "define-property": {
+              "version": "0.2.5",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-descriptor": "0.1.6"
+              }
+            },
+            "extend-shallow": {
+              "version": "2.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-extendable": "0.1.1"
+              }
+            },
+            "is-accessor-descriptor": {
+              "version": "0.1.6",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              },
+              "dependencies": {
+                "kind-of": {
+                  "version": "3.2.2",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-buffer": "1.1.6"
+                  }
+                }
+              }
+            },
+            "is-data-descriptor": {
+              "version": "0.1.4",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "kind-of": "3.2.2"
+              },
+              "dependencies": {
+                "kind-of": {
+                  "version": "3.2.2",
+                  "bundled": true,
+                  "dev": true,
+                  "requires": {
+                    "is-buffer": "1.1.6"
+                  }
+                }
+              }
+            },
+            "is-descriptor": {
+              "version": "0.1.6",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "is-accessor-descriptor": "0.1.6",
+                "is-data-descriptor": "0.1.4",
+                "kind-of": "5.1.0"
+              }
+            },
+            "kind-of": {
+              "version": "5.1.0",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
+        "snapdragon-node": {
+          "version": "2.1.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "define-property": "1.0.0",
+            "isobject": "3.0.1",
+            "snapdragon-util": "3.0.1"
+          },
+          "dependencies": {
+            "define-property": {
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+              "bundled": true,
+              "dev": true,
+              "requires": {
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+              }
+            },
+            "isobject": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true
+            }
+          }
+        },
+        "snapdragon-util": {
+          "version": "3.0.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "kind-of": "3.2.2"
+          }
+        },
         "source-map": {
           "version": "0.5.7",
           "bundled": true,
           "dev": true
         },
+        "source-map-resolve": {
+          "version": "0.5.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "atob": "2.0.3",
+            "decode-uri-component": "0.2.0",
+            "resolve-url": "0.2.1",
+            "source-map-url": "0.4.0",
+            "urix": "0.1.0"
+          }
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@@ -7404,23 +9636,111 @@
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@@ -7435,11 +9755,6 @@
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@@ -7477,15 +9792,249 @@
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@@ -7493,6 +10042,44 @@
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@@ -7529,13 +10116,106 @@
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@@ -7571,6 +10251,14 @@
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@@ -7609,11 +10297,11 @@
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@@ -7624,35 +10312,49 @@
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@@ -7668,18 +10370,100 @@
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+      "version": "2.3.4",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+      "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+      "dev": true,
+      "requires": {
+        "punycode": "1.4.1"
+      }
+    },
+    "tr46": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-1.0.1.tgz",
+      "integrity": "sha1-qLE/1r/SSJUZZ0zN5VujaTtwbQk=",
+      "dev": true,
+      "requires": {
+        "punycode": "2.1.0"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.0.tgz",
+          "integrity": "sha1-X4Y+3Im5bbCQdLrXlHvwkFbKTn0=",
+          "dev": true
+        }
+      }
+    },
     "trash": {
       "version": "3.4.2",
       "resolved": "https://registry.npmjs.org/trash/-/trash-3.4.2.tgz",
@@ -9689,6 +13012,12 @@
           "requires": {
             "pinkie": "2.0.4"
           }
+        },
+        "uuid": {
+          "version": "2.0.3",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+          "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
+          "dev": true
         }
       }
     },
@@ -9733,6 +13062,22 @@
       "integrity": "sha512-RPXpVjsbtWgymwGq5F/OWDFsjEzdvzwHFaMjWWW6f/p6+uk/N7YSKJHQfIfGqITfj8qH4cBqCLMnhKZBaKk7Kg==",
       "dev": true
     },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "dev": true,
+      "optional": true
+    },
     "type-check": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
@@ -9792,7 +13137,7 @@
       "dev": true,
       "requires": {
         "camelcase": "4.1.0",
-        "chalk": "2.3.1",
+        "chalk": "2.3.2",
         "chokidar": "1.7.0",
         "json5": "0.5.1",
         "minimist": "1.2.0",
@@ -9806,7 +13151,7 @@
       "integrity": "sha512-N7b7HG6doQUtkWr+kH35tfUhfc9QiYeiZGG6TcZlexSURf4xRUpYKBbc2f67qJF5oPmn6mMkImkdhr31Q6saoA==",
       "dev": true,
       "requires": {
-        "concat-stream": "1.6.0",
+        "concat-stream": "1.6.2",
         "debug": "3.1.0",
         "fault": "1.0.1",
         "fn-name": "2.0.1",
@@ -9815,7 +13160,7 @@
         "is-empty": "1.2.0",
         "is-hidden": "1.1.1",
         "is-object": "1.0.1",
-        "js-yaml": "3.10.0",
+        "js-yaml": "3.11.0",
         "load-plugin": "2.2.1",
         "parse-json": "4.0.0",
         "to-vfile": "2.2.0",
@@ -9848,6 +13193,41 @@
         "vfile-location": "2.0.2"
       }
     },
+    "union-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
+      "integrity": "sha1-XHHDTLW61dzr4+oM0IIHulqhrqQ=",
+      "dev": true,
+      "requires": {
+        "arr-union": "3.1.0",
+        "get-value": "2.0.6",
+        "is-extendable": "0.1.1",
+        "set-value": "0.4.3"
+      },
+      "dependencies": {
+        "extend-shallow": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+          "dev": true,
+          "requires": {
+            "is-extendable": "0.1.1"
+          }
+        },
+        "set-value": {
+          "version": "0.4.3",
+          "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
+          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE=",
+          "dev": true,
+          "requires": {
+            "extend-shallow": "2.0.1",
+            "is-extendable": "0.1.1",
+            "is-plain-object": "2.0.4",
+            "to-object-path": "0.3.0"
+          }
+        }
+      }
+    },
     "unique-string": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-1.0.0.tgz",
@@ -9933,6 +13313,52 @@
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.1.tgz",
       "integrity": "sha1-+nG63UQ3r0wUiEHjs7Fl+enlkLc="
     },
+    "unset-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "dev": true,
+      "requires": {
+        "has-value": "0.3.1",
+        "isobject": "3.0.1"
+      },
+      "dependencies": {
+        "has-value": {
+          "version": "0.3.1",
+          "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+          "dev": true,
+          "requires": {
+            "get-value": "2.0.6",
+            "has-values": "0.1.4",
+            "isobject": "2.1.0"
+          },
+          "dependencies": {
+            "isobject": {
+              "version": "2.1.0",
+              "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+              "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=",
+              "dev": true,
+              "requires": {
+                "isarray": "1.0.0"
+              }
+            }
+          }
+        },
+        "has-values": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
+          "dev": true
+        },
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+          "dev": true
+        }
+      }
+    },
     "untildify": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/untildify/-/untildify-2.1.0.tgz",
@@ -9949,15 +13375,16 @@
       "dev": true
     },
     "update-notifier": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-2.3.0.tgz",
-      "integrity": "sha1-TognpruRUUCrCTVZ1wFOPruDdFE=",
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-2.4.0.tgz",
+      "integrity": "sha1-+bTHAPv9TsEsgRWHJYd31WPYyGY=",
       "dev": true,
       "requires": {
         "boxen": "1.3.0",
-        "chalk": "2.3.1",
-        "configstore": "3.1.1",
+        "chalk": "2.3.2",
+        "configstore": "3.1.2",
         "import-lazy": "2.1.0",
+        "is-ci": "1.1.0",
         "is-installed-globally": "0.1.0",
         "is-npm": "1.0.0",
         "latest-version": "3.1.0",
@@ -9965,6 +13392,12 @@
         "xdg-basedir": "3.0.0"
       }
     },
+    "urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
+      "dev": true
+    },
     "url-parse-lax": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-1.0.0.tgz",
@@ -9991,6 +13424,23 @@
         }
       }
     },
+    "use": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.0.tgz",
+      "integrity": "sha512-6UJEQM/L+mzC3ZJNM56Q4DFGLX/evKGRg15UJHGB9X5j5Z3AFbgZvjUh2yq/UJUY4U5dh7Fal++XbNg1uzpRAw==",
+      "dev": true,
+      "requires": {
+        "kind-of": "6.0.2"
+      },
+      "dependencies": {
+        "kind-of": {
+          "version": "6.0.2",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
+          "integrity": "sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA==",
+          "dev": true
+        }
+      }
+    },
     "user-home": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/user-home/-/user-home-1.1.1.tgz",
@@ -10004,9 +13454,9 @@
       "dev": true
     },
     "uuid": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
-      "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.2.1.tgz",
+      "integrity": "sha512-jZnMwlb9Iku/O3smGWvZhauCf6cvvpKi4BKRiliS3cxnI+Gz9j5MEpTz2UFuXiKPJocb7gnsLHwiS05ige5BEA==",
       "dev": true
     },
     "v8flags": {
@@ -10019,12 +13469,23 @@
       }
     },
     "validate-npm-package-license": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz",
-      "integrity": "sha1-KAS6vnEq0zeUWaz74kdGqywwP7w=",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.3.tgz",
+      "integrity": "sha512-63ZOUnL4SIXj4L0NixR3L1lcjO38crAbgrTpl28t8jjrfuiOBL5Iygm+60qPs/KsZGzPNg6Smnc/oY16QTjF0g==",
+      "requires": {
+        "spdx-correct": "3.0.0",
+        "spdx-expression-parse": "3.0.0"
+      }
+    },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
       "requires": {
-        "spdx-correct": "1.0.2",
-        "spdx-expression-parse": "1.0.4"
+        "assert-plus": "1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "1.3.0"
       }
     },
     "vfile": {
@@ -10113,18 +13574,53 @@
       "integrity": "sha1-AhBMYP3u0dEbH3OtZTMLdjSz2JU=",
       "dev": true
     },
+    "w3c-hr-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.1.tgz",
+      "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "dev": true,
+      "requires": {
+        "browser-process-hrtime": "0.1.2"
+      }
+    },
+    "webidl-conversions": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "dev": true
+    },
     "well-known-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/well-known-symbols/-/well-known-symbols-1.0.0.tgz",
       "integrity": "sha1-c8eK6Bp3Jqj6WY4ogIAcixYiVRg=",
       "dev": true
     },
+    "whatwg-encoding": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.3.tgz",
+      "integrity": "sha512-jLBwwKUhi8WtBfsMQlL4bUUcT8sMkAtQinscJAe/M4KHCkHuUJAF6vuB0tueNIw4c8ziO6AkRmgY+jL3a0iiPw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.19"
+      }
+    },
     "whatwg-fetch": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.3.tgz",
       "integrity": "sha1-nITsLc9oGH/wC8ZOEnS0QhduHIQ=",
       "dev": true
     },
+    "whatwg-url": {
+      "version": "6.4.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-6.4.0.tgz",
+      "integrity": "sha512-Z0CVh/YE217Foyb488eo+iBv+r7eAQ0wSTyApi9n06jhcA3z6Nidg/EGvl0UFkg7kMdKxfBzzr+o9JF+cevgMg==",
+      "dev": true,
+      "requires": {
+        "lodash.sortby": "4.7.0",
+        "tr46": "1.0.1",
+        "webidl-conversions": "4.0.2"
+      }
+    },
     "which": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
@@ -10225,6 +13721,16 @@
         "write-json-file": "2.3.0"
       }
     },
+    "ws": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-4.1.0.tgz",
+      "integrity": "sha512-ZGh/8kF9rrRNffkLFV4AzhvooEclrOH0xaugmqGsIfFgOE/pIz4fMc4Ef+5HSQqTEug2S9JZIWDR47duDSLfaA==",
+      "dev": true,
+      "requires": {
+        "async-limiter": "1.0.0",
+        "safe-buffer": "5.1.1"
+      }
+    },
     "x-is-function": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/x-is-function/-/x-is-function-1.0.4.tgz",
@@ -10282,6 +13788,12 @@
         }
       }
     },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
diff --git a/package.json b/package.json
index be30e17..ae7c280 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "generate-robotstxt",
-  "version": "5.0.4",
+  "version": "5.0.5",
   "description": "Awesome generator robots.txt",
   "author": "itgalaxy <development@itgalaxy.company>",
   "contributors": [
@@ -20,7 +20,12 @@
     "generate",
     "robots-txt",
     "user-agent",
-    "police"
+    "police",
+    "allow",
+    "disallow",
+    "crawl-delay",
+    "robot",
+    "robots"
   ],
   "bugs": {
     "url": "https://github.com/itgalaxy/generate-robotstxt/issues"
@@ -44,12 +49,13 @@
     "babel-cli": "^6.22.2",
     "babel-preset-env": "^1.6.0",
     "babel-register": "^6.9.0",
+    "babel-eslint": "^8.2.2",
     "npm-run-all": "^4.0.0",
     "npmpub": "^3.1.0",
     "eslint": "^4.9.0",
     "eslint-plugin-ava": "^4.2.1",
     "eslint-plugin-import": "^2.8.0",
-    "eslint-plugin-itgalaxy": "^64.0.0",
+    "eslint-plugin-itgalaxy": "^66.0.0",
     "eslint-plugin-jest": "^21.2.0",
     "eslint-plugin-jsx-a11y": "^6.0.0",
     "eslint-plugin-lodash": "^2.4.3",
@@ -58,7 +64,7 @@
     "eslint-plugin-promise": "^3.6.0",
     "eslint-plugin-react": "^7.1.0",
     "eslint-plugin-unicorn": "^4.0.2",
-    "execa": "^0.9.0",
+    "execa": "^0.10.0",
     "remark-cli": "^5.0.0",
     "remark-preset-lint-itgalaxy": "^12.0.0",
     "rimraf": "^2.5.2",
@@ -66,7 +72,7 @@
     "tempfile": "^2.0.0",
     "path-exists": "^3.0.0",
     "husky": "^0.14.0",
-    "lint-staged": "^6.0.0",
+    "lint-staged": "^7.0.0",
     "prettier": "^1.5.2"
   },
   "scripts": {
diff --git a/src/__tests__/standalone.js b/src/__tests__/standalone.js
index af74d3d..26e327f 100644
--- a/src/__tests__/standalone.js
+++ b/src/__tests__/standalone.js
@@ -22,7 +22,7 @@ test("should contain one `policy` item with the `Allow` directive", t =>
     t.is(content, "User-agent: Google\nAllow: /\n");
   }));
 
-test("should contain two `policy` items with the `Allow` directive", t =>
+test("should contain one `policy` items with the `Allow` directive", t =>
   generateRobotstxt({
     policy: [
       {
@@ -34,7 +34,7 @@ test("should contain two `policy` items with the `Allow` directive", t =>
     t.is(content, "User-agent: Google\nAllow: /\nAllow: /foobar\n");
   }));
 
-test("should contain two `policy` items with the `Disallow` directive", t =>
+test("should contain one `policy` items with the `Disallow` directive", t =>
   generateRobotstxt({
     policy: [
       {
@@ -448,3 +448,34 @@ test.serial("should load a config file", t => {
       return Promise.resolve();
     });
 });
+
+test("should contain two `policy` items with empty `Disallow` directive", t =>
+  generateRobotstxt({
+    policy: [
+      {
+        allow: "",
+        disallow: "",
+        userAgent: "*"
+      },
+      {
+        allow: "",
+        disallow: [""],
+        userAgent: "Foo"
+      }
+    ]
+  }).then(content => {
+    t.is(content, "User-agent: *\nDisallow:\n\nUser-agent: Foo\nDisallow:\n");
+  }));
+
+test("should contain one policy item without empty `Clean-param` option", t =>
+  generateRobotstxt({
+    policy: [
+      {
+        allow: "/",
+        cleanParam: [],
+        userAgent: "Yandex"
+      }
+    ]
+  }).then(content => {
+    t.is(content, "User-agent: Yandex\nAllow: /\n");
+  }));
diff --git a/src/standalone.js b/src/standalone.js
index 2807694..9fabf23 100644
--- a/src/standalone.js
+++ b/src/standalone.js
@@ -10,17 +10,19 @@ function capitaliseFirstLetter(string) {
 function addLine(name, rule) {
   let contents = "";
 
-  if (rule && Object.prototype.toString.call(rule) === "[object Array]") {
+  if (rule && Array.isArray(rule) && rule.length > 0) {
     rule.forEach(item => {
       contents += addLine(name, item);
     });
   } else {
-    const ruleContent =
-      name === "Allow" || name === "Disallow" ? encodeURI(rule) : rule;
+    const ruleContent = (name === "Allow" || name === "Disallow"
+      ? encodeURI(rule)
+      : rule
+    ).toString();
 
     contents += `${capitaliseFirstLetter(
       name.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase()
-    )}: ${ruleContent}\n`;
+    )}:${ruleContent.length > 0 ? ` ${ruleContent}` : ""}\n`;
   }
 
   return contents;
@@ -39,7 +41,7 @@ function generatePoliceItem(item, index) {
     contents += addLine("Allow", item.allow);
   }
 
-  if (item.disallow) {
+  if (typeof item.disallow === "string" || Array.isArray(item.disallow)) {
     contents += addLine("Disallow", item.disallow);
   }
 
@@ -47,7 +49,9 @@ function generatePoliceItem(item, index) {
     contents += addLine("Crawl-delay", item.crawlDelay);
   }
 
-  if (item.cleanParam) {
+  // Move from policy for next master version
+  // https://yandex.ru/support/webmaster/controlling-robot/robots-txt.html
+  if (item.cleanParam && item.cleanParam.length > 0) {
     contents += addLine("Clean-param", item.cleanParam);
   }
 
@@ -97,10 +101,7 @@ export default function({
             }
 
             options.policy.forEach(item => {
-              if (
-                !item.userAgent ||
-                (item.userAgent && item.userAgent.length === 0)
-              ) {
+              if (!item.userAgent || item.userAgent.length === 0) {
                 throw new Error(
                   "Each `policy` should have a single string `userAgent` option"
                 );