Merge pull request #20 from pine/greenkeeper/webpack-cli-3.1.1

Update webpack-cli to the latest version 🚀

Author: pine

package.json

@@ -32,7 +32,7 @@
     "npm-run-all": "^4.1.2",
     "text-encoding": "^0.7.0",
     "webpack": "4.18.1",
-    "webpack-cli": "^2.0.13"
+    "webpack-cli": "^3.1.1"
   },
   "author": {
     "name": "Pine Mizune",