chore(package): update webpack to version 3.8.1

Closes #183

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "typedoc": "0.9.0",
     "typescript": "2.5.3",
     "uuid": "3.1.0",
-    "webpack": "3.6.0"
+    "webpack": "3.8.1"
   },
   "scripts": {
     "test": "karma start karma.conf.js",