Update eslint to version 3.15.0 🚀

[greenkeeperio-bot]

Hello lovely humans,

eslint just published its new version 3.15.0.

State	Update 🚀
Dependency	eslint
New version	3.15.0
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

• f2a3580 Fix: no-extra-parens incorrect precedence (fixes #7978) (#7999) (alberto)
• d6b6ba1 Fix: no-var should fix ForStatement.init (#7993) (Toru Nagashima)
• 99d386d Upgrade: Espree v3.4.0 (#8019) (Kai Cataldo)
• 42390fd Docs: update README.md for team (#8016) (Toru Nagashima)
• d7ffd88 Chore: enable template-tag-spacing on ESLint codebase (#8005) (Teddy Katz)
• f2be7e3 Docs: Fix typo in object-curly-newline.md (#8002) (Danny Andrews)
• df2351a Docs: Fix misleading section in brace-style documentation (#7996) (Teddy Katz)
• 5ae6e00 Chore: avoid unnecessary feature detection for Symbol (#7992) (Teddy Katz)
• 5d57c57 Chore: fix no-else-return lint error (refs #7986) (#7994) (Vitor Balocco)
• 62fb054 Chore: enable no-else-return on ESLint codebase (#7986) (Teddy Katz)
• c59a0ba Update: add ignoreRestSiblings option to no-unused-vars (#7968) (Zack Argyle)
• 5cdfa99 Chore: enable no-unneeded-ternary on ESLint codebase (#7987) (Teddy Katz)
• fbd7c13 Update: ensure operator-assignment handles exponentiation operators (#7970) (Teddy Katz)
• c5066ce Update: add "variables" option to no-use-before-define (fixes #7111) (#7948) (Teddy Katz)
• 09546a4 New: template-tag-spacing rule (fixes #7631) (#7913) (Jonathan Wilsson)

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The new version differs by 2163 commits .

• 8ea98f9 3.15.0
• 77b5cb7 Build: package.json and changelog update for 3.15.0
• f2a3580 Fix: no-extra-parens incorrect precedence (fixes #7978) (#7999)
• d6b6ba1 Fix: no-var should fix ForStatement.init (#7993)
• 99d386d Upgrade: Espree v3.4.0 (#8019)
• 42390fd Docs: update README.md for team (#8016)
• d7ffd88 Chore: enable template-tag-spacing on ESLint codebase (#8005)
• f2be7e3 Docs: Fix typo in object-curly-newline.md (#8002)
• df2351a Docs: Fix misleading section in brace-style documentation (#7996)
• 5ae6e00 Chore: avoid unnecessary feature detection for Symbol (#7992)
• 5d57c57 Chore: fix no-else-return lint error (refs #7986) (#7994)
• 62fb054 Chore: enable no-else-return on ESLint codebase (#7986)
• c59a0ba Update: add ignoreRestSiblings option to no-unused-vars (#7968)
• 5cdfa99 Chore: enable no-unneeded-ternary on ESLint codebase (#7987)
• fbd7c13 Update: ensure operator-assignment handles exponentiation operators (#7970)

There are 250 commits in total. See the full diff.

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