Bump karma from 1.7.1 to 2.0.0

Bumps [karma](https://github.com/karma-runner/karma) from 1.7.1 to 2.0.0.
- [Release notes](https://github.com/karma-runner/karma/releases/tag/v2.0.0)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma/compare/v1.7.1...v2.0.0)

package.json

@@ -19,7 +19,7 @@
     "jasmine-ajax": "^3.3.1",
     "jasmine-core": "^2.8.0",
     "jquery": "^3.2.1",
-    "karma": "^1.7.1",
+    "karma": "^2.0.0",
     "karma-coverage": "^1.1.1",
     "karma-jasmine": "^1.1.1",
     "karma-jasmine-ajax": "^0.1.13",