Bump karma from 1.7.1 to 4.0.0

Bumps [karma](https://github.com/karma-runner/karma) from 1.7.1 to 4.0.0.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma/compare/v1.7.1...v4.0.0)
Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -66,7 +66,7 @@
     "istanbul": "^0.4.5",
     "jquery": "^3.2.1",
     "js-polyfills": "^0.1.16",
-    "karma": "^1.1.0",
+    "karma": "^4.0.0",
     "karma-browserify": "^5.0.5",
     "karma-chai": "^0.1.0",
     "karma-coverage": "^1.1.1",