Update grunt-karma requirement from ^2.0.0 to ^3.0.0

Updates the requirements on [grunt-karma](https://github.com/karma-runner/grunt-karma) to permit the latest version.
- [Release notes](https://github.com/karma-runner/grunt-karma/releases)
- [Changelog](https://github.com/karma-runner/grunt-karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/grunt-karma@v2.0.0...v3.0.0)

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

package.json

@@ -42,7 +42,7 @@
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-uglify": "^4.0.1",
     "grunt-eslint": "^22.0.0",
-    "grunt-karma": "^2.0.0",
+    "grunt-karma": "^3.0.0",
     "grunt-karma-coveralls": "^2.5.4",
     "grunt-run": "^0.8.1",
     "grunt-webpack": "^3.1.3",