chore(package): update webpack to version 2.3.2

Closes #55

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -84,6 +84,6 @@
     "rollup-plugin-babel": "2.7.1",
     "sinon": "1.17.7",
     "sinon-chai": "2.8.0",
-    "webpack": "1.14.0"
+    "webpack": "2.3.2"
   }
 }