Bumps [karma](https://github.com/karma-runner/karma) from 3.1.4 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/v3.1.4...v4.0.0) Signed-off-by: dependabot[bot] <support@dependabot.com>