chore(package): update karma-webpack to version 3.0.3

Closes #1

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
     "karma-opera-launcher": "^1.0.0",
     "karma-safari-launcher": "^1.0.0",
     "karma-sauce-launcher": "^1.0.0",
-    "karma-webpack": "^1.8.0",
+    "karma-webpack": "^3.0.3",
     "webpack": "^2.1.0-beta.1"
   },
   "license": "MIT",