diff --git a/package-lock.json b/package-lock.json
index 2b3b1b8..c0d5905 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -310,7 +310,7 @@
 				},
 				"util": {
 					"version": "0.10.3",
-					"resolved": "http://registry.npmjs.org/util/-/util-0.10.3.tgz",
+					"resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
 					"integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
 					"dev": true,
 					"requires": {
@@ -1374,7 +1374,8 @@
 				"ansi-regex": {
 					"version": "2.1.1",
 					"bundled": true,
-					"dev": true
+					"dev": true,
+					"optional": true
 				},
 				"aproba": {
 					"version": "1.2.0",
@@ -1789,7 +1790,8 @@
 				"safe-buffer": {
 					"version": "5.1.1",
 					"bundled": true,
-					"dev": true
+					"dev": true,
+					"optional": true
 				},
 				"safer-buffer": {
 					"version": "2.1.2",
@@ -1845,6 +1847,7 @@
 					"version": "3.0.1",
 					"bundled": true,
 					"dev": true,
+					"optional": true,
 					"requires": {
 						"ansi-regex": "^2.0.0"
 					}
@@ -1888,12 +1891,14 @@
 				"wrappy": {
 					"version": "1.0.2",
 					"bundled": true,
-					"dev": true
+					"dev": true,
+					"optional": true
 				},
 				"yallist": {
 					"version": "3.0.2",
 					"bundled": true,
-					"dev": true
+					"dev": true,
+					"optional": true
 				}
 			}
 		},
@@ -4069,7 +4074,7 @@
 				},
 				"strip-ansi": {
 					"version": "3.0.1",
-					"resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+					"resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
 					"integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
 					"dev": true,
 					"requires": {
@@ -4097,9 +4102,9 @@
 			"dev": true
 		},
 		"y18n": {
-			"version": "4.0.0",
-			"resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-			"integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+			"version": "4.0.1",
+			"resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
+			"integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==",
 			"dev": true
 		},
 		"yallist": {
@@ -4110,7 +4115,7 @@
 		},
 		"yargs": {
 			"version": "1.2.6",
-			"resolved": "http://registry.npmjs.org/yargs/-/yargs-1.2.6.tgz",
+			"resolved": "https://registry.npmjs.org/yargs/-/yargs-1.2.6.tgz",
 			"integrity": "sha1-nHtKgv1dWVsr8Xq23MQxNUMv40s=",
 			"dev": true,
 			"requires": {