Update webpack to the latest version 🚀 (#895)

* chore(package): update webpack to version 4.19.0

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

Author: greenkeeper[bot]

package-lock.json

@@ -88,7 +88,7 @@
     "sass-loader": "~7.1.0",
     "style-loader": "~0.23.0",
     "svg-prep": "~1.0.0",
-    "webpack": "~4.18.0",
+    "webpack": "~4.19.0",
     "webpack-cli": "^3.0.8"
   },
   "scripts": {