chore(package): update webpack to version 4.7.0

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "stylelint-order": "0.8.1",
     "stylelint-scss": "3.1.0",
     "stylelint-webpack-plugin": "0.10.4",
-    "webpack": "4.6.0",
+    "webpack": "4.7.0",
     "webpack-cli": "2.1.2"
   },
   "browserslist": [