Bump karma-webpack from 2.0.9 to 2.0.13

Bumps [karma-webpack](https://github.com/webpack-contrib/karma-webpack) from 2.0.9 to 2.0.13.
- [Release notes](https://github.com/webpack-contrib/karma-webpack/releases)
- [Changelog](https://github.com/webpack-contrib/karma-webpack/blob/master/CHANGELOG.md)
- [Commits](codymikol/karma-webpack@v2.0.9...v2.0.13)

package.json

@@ -24,7 +24,7 @@
     "karma-jasmine-ajax": "^0.1.13",
     "karma-phantomjs-launcher": "^1.0.4",
     "karma-sourcemap-loader": "^0.3.7",
-    "karma-webpack": "^2.0.9",
+    "karma-webpack": "^2.0.13",
     "underscore": "^1.8.3",
     "webpack": "^3.11.0",
     "webpack-merge": "^4.1.2"