feat(package.json): remove unused dependencies

package.json

@@ -77,11 +77,8 @@
   "dependencies": {
     "babel-runtime": "^6.26.0",
     "classnames": "^2.2.5",
-    "create-react-class": "^15.6.0",
-    "element-class": "^0.2.2",
-    "immutability-helper": "^2.3.1",
-    "lodash": "^4.17.4",
-    "prop-types": "^15.5.10"
+    "dom-helpers": "^3.2.1",
+    "lodash": "^4.17.4"
   },
   "peerDependencies": {
     "react": "^0.14.0 || ^15.0.0 || ^16.0.0",

yarn.lock

@@ -2534,10 +2534,6 @@ elegant-spinner@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/elegant-spinner/-/elegant-spinner-1.0.1.tgz#db043521c95d7e303fd8f345bedc3349cfb0729e"
 
-element-class@^0.2.2:
-  version "0.2.2"
-  resolved "https://registry.yarnpkg.com/element-class/-/element-class-0.2.2.tgz#9d3bbd0767f9013ef8e1c8ebe722c1402a60050e"
-
 elliptic@^6.0.0:
   version "6.4.0"
   resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.4.0.tgz#cac9af8762c85836187003c8dfe193e5e2eae5df"
@@ -3816,12 +3812,6 @@ ignore@^3.3.3:
   version "3.3.7"
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-3.3.7.tgz#612289bfb3c220e186a58118618d5be8c1bab021"
 
-immutability-helper@^2.3.1:
-  version "2.4.0"
-  resolved "https://registry.yarnpkg.com/immutability-helper/-/immutability-helper-2.4.0.tgz#00d421e2957c17f0f0781475f05ffd837e73458d"
-  dependencies:
-    invariant "^2.2.0"
-
 import-local@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/import-local/-/import-local-0.1.1.tgz#b1179572aacdc11c6a91009fb430dbcab5f668a8"
@@ -3925,7 +3915,7 @@ interpret@^1.0.0:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/interpret/-/interpret-1.0.4.tgz#820cdd588b868ffb191a809506d6c9c8f212b1b0"
 
-invariant@^2.2.0, invariant@^2.2.2:
+invariant@^2.2.2:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/invariant/-/invariant-2.2.2.tgz#9e1f56ac0acdb6bf303306f338be3b204ae60360"
   dependencies: