Update karma requirement to ^2.0.4

[dependabot-preview[bot]]

Updates the requirements on karma to permit the latest version.

Release notes

*Sourced from [karma's releases](https://github.com/karma-runner/karma/releases).* > ## v2.0.4 > ### Bug Fixes > > * **deps:** remove babel-core and babel call in wallaby. ([#3044](https://github-redirect.dependabot.com/karma-runner/karma/issues/3044)) ([7da8ca0](https://github.com/karma-runner/karma/commit/7da8ca0)) > * **events:** bind emitters with for..in. ([#3059](https://github-redirect.dependabot.com/karma-runner/karma/issues/3059)) ([b99f03f](https://github.com/karma-runner/karma/commit/b99f03f)), closes [#3057](https://github-redirect.dependabot.com/karma-runner/karma/issues/3057) > * **launcher:** Only markCaptured browsers that are launched. ([#3047](https://github-redirect.dependabot.com/karma-runner/karma/issues/3047)) ([f8f3ebc](https://github.com/karma-runner/karma/commit/f8f3ebc)) > * **server:** actually call stert(). ([#3062](https://github-redirect.dependabot.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-redirect.dependabot.com/karma-runner/karma/issues/3055)) ([c88ebc6](https://github.com/karma-runner/karma/commit/c88ebc6))

Changelog

*Sourced from [karma's changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md).* > ## [2.0.4](https://github.com/karma-runner/karma/compare/v2.0.3...v2.0.4) (2018-06-21) > > > ### Bug Fixes > > * **deps:** remove babel-core and babel call in wallaby. ([#3044](https://github-redirect.dependabot.com/karma-runner/karma/issues/3044)) ([7da8ca0](https://github.com/karma-runner/karma/commit/7da8ca0)) > * **events:** bind emitters with for..in. ([#3059](https://github-redirect.dependabot.com/karma-runner/karma/issues/3059)) ([b99f03f](https://github.com/karma-runner/karma/commit/b99f03f)), closes [#3057](https://github-redirect.dependabot.com/karma-runner/karma/issues/3057) > * **launcher:** Only markCaptured browsers that are launched. ([#3047](https://github-redirect.dependabot.com/karma-runner/karma/issues/3047)) ([f8f3ebc](https://github.com/karma-runner/karma/commit/f8f3ebc)) > * **server:** actually call stert(). ([#3062](https://github-redirect.dependabot.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-redirect.dependabot.com/karma-runner/karma/issues/3055)) ([c88ebc6](https://github.com/karma-runner/karma/commit/c88ebc6)) > > > > > ## [2.0.3](https://github.com/karma-runner/karma/compare/v0.12.16...v2.0.3) (2018-06-15) > > > ### Bug Fixes > > * **BaseReporter:** log message correctly with just one browser ([#3045](https://github-redirect.dependabot.com/karma-runner/karma/issues/3045)) ([c1eb236](https://github.com/karma-runner/karma/commit/c1eb236)) > * **browser:** don't add already active socket again on reconnect ([37a7958](https://github.com/karma-runner/karma/commit/37a7958)) > * **browser:** filter browser logging by level ([35965d9](https://github.com/karma-runner/karma/commit/35965d9)), closes [#2228](https://github-redirect.dependabot.com/karma-runner/karma/issues/2228) > * **browser:** nicer "disconnect" - no more "Disconnectedundefined" ([a987d63](https://github.com/karma-runner/karma/commit/a987d63)) > * **build:** pin npm version in appveyor to v3, compat with node 4 ([#2983](https://github-redirect.dependabot.com/karma-runner/karma/issues/2983)) ([bc1453e](https://github.com/karma-runner/karma/commit/bc1453e)) > * **ci:** Repaired AppVeyor for Node.js@0.12 ([cbfd98c](https://github.com/karma-runner/karma/commit/cbfd98c)) > * **cli:** override if an arg is defined multiple times ([31eb2c2](https://github.com/karma-runner/karma/commit/31eb2c2)), closes [#1192](https://github-redirect.dependabot.com/karma-runner/karma/issues/1192) > * **cli:** print UserAgent string verbatim if from an unknown browser ([9d97226](https://github.com/karma-runner/karma/commit/9d97226)) > * **cli:** restore shell completion in the npm package ([f56b5a5](https://github.com/karma-runner/karma/commit/f56b5a5)), closes [#2351](https://github-redirect.dependabot.com/karma-runner/karma/issues/2351) > * **cli:** Use `bin` field in package.json ([6823926](https://github.com/karma-runner/karma/commit/6823926)), closes [#1351](https://github-redirect.dependabot.com/karma-runner/karma/issues/1351) > * **client:** add ES5 shim ([14c30b7](https://github.com/karma-runner/karma/commit/14c30b7)), closes [#1529](https://github-redirect.dependabot.com/karma-runner/karma/issues/1529) > * **client:** add proxy support to stringify ([be10116](https://github.com/karma-runner/karma/commit/be10116)) > * **client:** does not throws an error for non DOM object that has `tagName` property ([ba55afb](https://github.com/karma-runner/karma/commit/ba55afb)), closes [#2139](https://github-redirect.dependabot.com/karma-runner/karma/issues/2139) > * **client:** don't crash if receive array-like results ([e095411](https://github.com/karma-runner/karma/commit/e095411)), closes [#2061](https://github-redirect.dependabot.com/karma-runner/karma/issues/2061) > * **client:** dynamic protocol for socket.io ([c986eef](https://github.com/karma-runner/karma/commit/c986eef)), closes [#1400](https://github-redirect.dependabot.com/karma-runner/karma/issues/1400) > * **client:** Fix stringify serializing objects ([0d0972a](https://github.com/karma-runner/karma/commit/0d0972a)) > * **client:** Revert back to old reloading detection ([f1c22d6](https://github.com/karma-runner/karma/commit/f1c22d6)), closes [#1656](https://github-redirect.dependabot.com/karma-runner/karma/issues/1656) > * **client:** serialise DOM objects ([1f73be4](https://github.com/karma-runner/karma/commit/1f73be4)), closes [#1106](https://github-redirect.dependabot.com/karma-runner/karma/issues/1106) > * **client:** Update location detection for socket.io ([7a23fa5](https://github.com/karma-runner/karma/commit/7a23fa5)) > * **client:** Use supported shim path. ([184f12e](https://github.com/karma-runner/karma/commit/184f12e)) > * **client:** Wait for childwindow to load ([c1bb15a](https://github.com/karma-runner/karma/commit/c1bb15a)) > * **client:** Wait for iframe to be loaded ([1631474](https://github.com/karma-runner/karma/commit/1631474)), closes [#1652](https://github-redirect.dependabot.com/karma-runner/karma/issues/1652) > * **client.html:** always open debug.html in a new browser process ([d176bcf](https://github.com/karma-runner/karma/commit/d176bcf)) > * **common:** fix AppVeyor build ([6c5e7d0](https://github.com/karma-runner/karma/commit/6c5e7d0)) > * **common:** more detailed info about error ([424aacc](https://github.com/karma-runner/karma/commit/424aacc)) > * **common:** Proxy function toString does not contain Proxy. ([4fb3484](https://github.com/karma-runner/karma/commit/4fb3484)) > * **common:** stringify error on 'Cannot convert a Symbol value to a string' ([#2990](https://github-redirect.dependabot.com/karma-runner/karma/issues/2990)) ([65b658a](https://github.com/karma-runner/karma/commit/65b658a)), closes [#2856](https://github-redirect.dependabot.com/karma-runner/karma/issues/2856) > * **config:** [#1113](https://github-redirect.dependabot.com/karma-runner/karma/issues/1113) Watching is not working properly on linux ([c91ffbc](https://github.com/karma-runner/karma/commit/c91ffbc)) > * **config:** add crossOriginAttribute config option ([1e465b1](https://github.com/karma-runner/karma/commit/1e465b1)) > * **config:** Call debug log methods after setting the loglevel based upon config/cli-options. ([a340dae](https://github.com/karma-runner/karma/commit/a340dae)) > * **config:** Call debug log methods after setting the loglevel based upon config/cli-options. ([99fd3f0](https://github.com/karma-runner/karma/commit/99fd3f0)) > ... (truncated)

Commits

- See full diff in [compare view](https://github.com/karma-runner/karma/commits/v2.0.4)

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[ComcastOSS]

FYI, we're experimenting with Dependabot. Seems the default settings are aggressive, so I'll close this and update the Dependabot config to only send PRs for dependencies when there are security updates.

[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.