Bump karma from 0.13.22 to 6.3.1

Bumps [karma](https://github.com/karma-runner/karma) from 0.13.22 to 6.3.1.
- [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/v0.13.22...v6.3.1)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -7,7 +7,7 @@
   },
   "devDependencies": {
     "jasmine-core": "~2.4.1",
-    "karma": "~0.13.22",
+    "karma": "~6.3.1",
     "karma-chrome-launcher": "~3.1.0",
     "karma-coffee-preprocessor": "~1.0.1",
     "karma-jasmine": "~0.3.8"