chore(package): update webpack to version 3.5.4

Closes #130

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "typedoc": "0.8.0",
     "typescript": "2.4.2",
     "uuid": "3.1.0",
-    "webpack": "3.5.2"
+    "webpack": "3.5.4"
   },
   "scripts": {
     "test": "karma start karma.conf.js",