chore(package): update webpack to version 3.5.2

Closes #12

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "pre-commit": "^1.2.2",
     "react-addons-test-utils": "^15.4.2",
     "semantic-release": "^6.3.2",
-    "webpack": "^2.3.0",
+    "webpack": "^3.5.2",
     "webpack-dev-server": "^2.2.1"
   },
   "config": {