Update webpack-cli to the latest version 🚀 (#1268)

* chore(package): update webpack-cli to version 3.3.8

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -101,7 +101,7 @@
     "style-loader": "1.0.0",
     "svg-prep": "1.0.4",
     "webpack": "4.39.3",
-    "webpack-cli": "3.3.7"
+    "webpack-cli": "3.3.8"
   },
   "scripts": {
     "dev": "node ./Parse-Dashboard/index.js & webpack --config webpack/build.config.js --devtool eval-source-map --progress --watch",