Update eslint to version 3.9.1 🚀

[greenkeeperio-bot]

Hello lovely humans,

eslint just published its new version 3.9.1.

State	Update 🚀
Dependency	eslint
New version	3.9.1
Type	devDependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of eslint.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

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You rock!

🌴

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GitHub Release

• 2012258 Fix: incorrect indent check for array property access (fixes #7484) (#7485) (Teddy Katz)
• 8a71d4a Fix: no-useless-return false positive on conditionals (fixes #7477) (#7482) (Teddy Katz)
• 56a662b Fix: allow escaped backreferences in no-useless-escape (fixes #7472) (#7474) (Teddy Katz)
• fffdf13 Build: Fix prefer-reflect rule to not crash site gen build (#7471) (Ilya Volodin)
• 8ba68a3 Docs: Update broken link (#7490) (Devinsuit)
• 65231d8 Docs: add the "fixable" icon for no-useless-return (#7480) (Teddy Katz)

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The new version differs by 107 commits .

• ea9d74b 3.9.1
• 705bb0e Build: package.json and changelog update for 3.9.1
• 2012258 Fix: incorrect indent check for array property access (fixes #7484) (#7485)
• 8a71d4a Fix: no-useless-return false positive on conditionals (fixes #7477) (#7482)
• 56a662b Fix: allow escaped backreferences in no-useless-escape (fixes #7472) (#7474)
• fffdf13 Build: Fix prefer-reflect rule to not crash site gen build (#7471)
• 8ba68a3 Docs: Update broken link (#7490)
• 65231d8 Docs: add the "fixable" icon for no-useless-return (#7480)
• 261d728 3.9.0
• c2e4f6d Build: package.json and changelog update for 3.9.0
• d933516 New: no-useless-return rule (fixes #7309) (#7441)
• 5e7af30 Update: Add CallExpression option for indent (fixes #5946) (#7189)
• b200086 Fix: Support type annotations in array-bracket-spacing (#7445)
• 5ed8b9b Update: Deprecate prefer-reflect (fixes #7226) (#7464)
• 92ad43b Chore: Update deprecated rules in conf/eslint.json (#7467)

There are 107 commits in total. See the full diff.

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This pull request was created by greenkeeper.io.

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