Update standard to version 6.0.0 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

standard just published its new version 6.0.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of standard – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 120 commits .

• 39a54d3 6.0.0
• 3afcc2c CHANGELOG.md for 6.0.0
• 0b71b07 eslint-plugin-promise@1.0.8
• 4b725bd lock to latest deps
• 0a9a77b eslint-config-standard@5.0.0
• 48fb60c add eslint-config-standard-jsx
• 8802ea7 run standard on ourselves
• 6fbd66d test: add --disabled flag to run disabled tests
• 910eaa5 depend on eslint-plugin-promise
• f0d1983 Remove React-specific rules (fixes #351)
• 8a095f1 readme: add one more gotcha
• fbb66c4 package.json
• 44b551a remove one more usage ofwin-spawn``
• f1ad085 eslint@^2.0.0-rc.0
• 1cdd9f5 clone test: ignore git output

There are 120 commits in total. See the full diff.

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