chore(package): update webpack-cli to version 3.0.2

Closes #114

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "uglify-es": "^3.3.10",
     "url-loader": "^1.0.1",
     "webpack": "^4.5.0",
-    "webpack-cli": "^2.0.14",
+    "webpack-cli": "^3.0.2",
     "webpack-dev-server": "^3.1.3"
   },
   "directories": {