chore(package): update webpack to version 4.5.0

Closes #92

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "stylelint-order": "0.8.1",
     "stylelint-scss": "3.0.0",
     "stylelint-webpack-plugin": "0.10.4",
-    "webpack": "4.4.0"
+    "webpack": "4.5.0"
   },
   "browserslist": [
     "> 0.5%",