Bump karma-coverage-istanbul-reporter from 2.0.5 to 2.1.0

Bumps [karma-coverage-istanbul-reporter](https://github.com/mattlewis92/karma-coverage-istanbul-reporter) from 2.0.5 to 2.1.0.
- [Release notes](https://github.com/mattlewis92/karma-coverage-istanbul-reporter/releases)
- [Changelog](https://github.com/mattlewis92/karma-coverage-istanbul-reporter/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mattlewis92/karma-coverage-istanbul-reporter/compare/v2.0.5...v2.1.0)

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

package.json

@@ -73,7 +73,7 @@
     "karma": "^4.1.0",
     "karma-chrome-launcher": "3.1.0",
     "karma-coverage": "^2.0.1",
-    "karma-coverage-istanbul-reporter": "^2.0.5",
+    "karma-coverage-istanbul-reporter": "^2.1.0",
     "karma-firefox-launcher": "^1.1.0",
     "karma-mocha": "1.3.0",
     "karma-sourcemap-loader": "^0.3.7",