fix(package): update webpack to version 4.11.0

Closes #190

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "react-popper": "^1.0.0-beta.6",
     "react-styleguidist": "^7.0.9",
     "react-text-mask": "^5.4.1",
-    "webpack": "^3.8.1"
+    "webpack": "^4.11.0"
   },
   "peerDependencies": {
     "react": "^16.2.0",