chore(deps): update dependency karma-webpack to v3.0.4

Author: renovate-bot

package.json

@@ -39,7 +39,7 @@
     "karma-remap-coverage": "0.1.5",
     "karma-sauce-launcher": "1.2.0",
     "karma-sourcemap-loader": "0.3.7",
-    "karma-webpack": "3.0.2",
+    "karma-webpack": "3.0.4",
     "lint-staged": "7.2.2",
     "mocha": "5.2.0",
     "phantomjs-prebuilt": "2.1.16",