chore(package): update webpack to version 2.3.0 (#19)

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -54,7 +54,7 @@
     "react": "^15.4.1",
     "react-test-renderer": "^15.4.1",
     "rimraf": "^2.5.4",
-    "webpack": "^1.14.0"
+    "webpack": "^2.3.0"
   },
   "peerDependencies": {
     "react": "^15.4.1"