Merge pull request #429 from LLK/greenkeeper/webpack-dev-server-2.3.0

Update webpack-dev-server to the latest version 🚀

Author: rschamp

package.json

@@ -45,6 +45,6 @@
     "tap": "10.1.0",
     "travis-after-all": "1.4.4",
     "webpack": "2.2.1",
-    "webpack-dev-server": "1.16.3"
+    "webpack-dev-server": "2.3.0"
   }
 }