chore(package): update webpack to version 2.3.3

Closes #46

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -50,6 +50,6 @@
     "react-addons-test-utils": "^15.3.2",
     "rimraf": "^2.5.2",
     "tape": "^4.5.1",
-    "webpack": "^1.12.14"
+    "webpack": "^2.3.3"
   }
 }