chore(package): update webpack to version 3.4.0

Closes #3

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "karma-safari-launcher": "^1.0.0",
     "karma-sauce-launcher": "^1.0.0",
     "karma-webpack": "^1.8.0",
-    "webpack": "^2.1.0-beta.1"
+    "webpack": "^3.4.0"
   },
   "license": "MIT",
   "repository": {