chore(package): update karma-webpack to version 2.0.4

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
     "karma-mocha-reporter": "2.2.3",
     "karma-remap-coverage": "0.1.4",
     "karma-sourcemap-loader": "0.3.7",
-    "karma-webpack": "2.0.3",
+    "karma-webpack": "2.0.4",
     "remap-istanbul": "0.9.5",
     "rimraf": "2.6.1",
     "rxjs": "5.4.1",