Update webpack-cli to the latest version 🚀 (#116)

* chore(package): update webpack-cli to version 3.0.1

Closes #113

* chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

* chore: Update dependencies to latest ⬆️

Fixes #101
Fixes #112

Author: mrchief

package.json

@@ -79,7 +79,7 @@
     "jsdom-global": "^3.0.2",
     "marked": "^0.3.17",
     "mini-css-extract-plugin": "^0.4.0",
-    "nyc": "^11.2.1",
+    "nyc": "^12.0.1",
     "postcss": "^6.0.16",
     "postcss-cssnext": "^3.1.0",
     "postcss-import": "^11.0.0",
@@ -100,8 +100,8 @@
     "url-loader": "^1.0.1",
     "webpack": "^4.6.0",
     "webpack-bundle-analyzer": "^2.9.2",
-    "webpack-cli": "^2.0.9",
-    "webpack-serve": "^0.3.1",
+    "webpack-cli": "^3.0.1",
+    "webpack-serve": "^1.0.2",
     "why-did-you-update": "^0.1.1"
   },
   "peerDependencies": {