Update dependency karma to v2.0.4

[renovate[bot]]

This Pull Request updates dependency karma from v2.0.3 to v2.0.4

Release Notes

### [`v2.0.4`](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md#​204httpsgithubcomkarma-runnerkarmacomparev203v204-2018-06-21) [Compare Source](https://github.com/karma-runner/karma/compare/v2.0.3...v2.0.4) ##### Bug Fixes * **deps:** remove babel-core and babel call in wallaby. ([#​3044](`https://github.com/karma-runner/karma/issues/3044`)) ([7da8ca0](https://github.com/karma-runner/karma/commit/7da8ca0)) * **events:** bind emitters with for..in. ([#​3059](`https://github.com/karma-runner/karma/issues/3059`)) ([b99f03f](https://github.com/karma-runner/karma/commit/b99f03f)), closes [#​3057](`https://github.com/karma-runner/karma/issues/3057`) * **launcher:** Only markCaptured browsers that are launched. ([#​3047](`https://github.com/karma-runner/karma/issues/3047`)) ([f8f3ebc](https://github.com/karma-runner/karma/commit/f8f3ebc)) * **server:** actually call stert(). ([#​3062](`https://github.com/karma-runner/karma/issues/3062`)) ([40d836a](https://github.com/karma-runner/karma/commit/40d836a)) * **server:** Resurrect static function Server.start() lost in 2.0.3 ([#​3055](`https://github.com/karma-runner/karma/issues/3055`)) ([c88ebc6](https://github.com/karma-runner/karma/commit/c88ebc6)) ---

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This PR has been generated by Renovate Bot.