Update standard to version 7.0.0 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

standard just published its new version 7.0.0, 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 50 commits .

• 3b85fa9 7.0.0
• 3aa9d57 CHANGELOG
• 0dc1b5d eslint-config-standard@5.3.0
• af003ad Merge pull request #505 from feross/greenkeeper-eslint-2.9.0
• 6d99ffc chore(package): update eslint to version 2.9.0
• 5a02ded add webstorm vote link to readme
• 65efd35 AUTHORS
• 1f33bd7 7.0.0-beta.0
• 5673177 standard-engine@4.0.0
• 57a5377 eslint-config-standard-jsx@1.2.0
• 82f286d eslint-config-standard@5.2.0
• 418a077 Merge pull request #469 from feross/undo-config-hacks
• dd7471f Remove cwd option to standard-engine
• be75cda Undo config hacks added in v6.0.2 and v6.0.3
• 730dcaf Merge pull request #488 from feross/greenkeeper-eslint-2.8.0

There are 50 commits in total. See the full diff.

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