chore(package): update webpack to version 3.6.0

Closes #54

Author: greenkeeper[bot]

package.json

@@ -91,7 +91,7 @@
     "safari-launcher": "^2.0.5",
     "semantic-release": "^6.3.6",
     "style-loader": "^0.18.0",
-    "webpack": "^2.2.1",
+    "webpack": "^3.6.0",
     "webpack-dev-server": "^2.4.1"
   }
 }