Update eslint to version 2.11.0 🚀

Created by: greenkeeperio-bot

Hello 👋

:rocket::rocket::rocket:

eslint just published its new version 2.11.0, 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 eslint – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 23 commits .

• 0e4c9c8 2.11.0
• 640a03d Build: package.json and changelog update for 2.11.0
• 77dd2b4 Fix: On --init, print message when package.json is invalid (fixes #6257) (#6261)
• 7f60186 Fix:--ignore-patterncan't uningnore files (fixes #6127) (#6253)
• fea8fe6 New: no-useless-rename (fixes #6058) (#6249)
• b4cff9d Fix: Incorrect object-property-newline behavior (fixes #6207) (#6213)
• 35b4656 Docs: Edit arrow-parens.md to show correct output value (#6245)
• ee0cd58 Fix:newline-before-returnshouldn't disallow newlines (fixes #6176) (#6217)
• d4f5526 Fix:vars-on-topcrashs at export declarations (fixes #6210) (#6220)
• 088bda9 New:unicode-bomrule to allow or disallow BOM (fixes #5502) (#6230)
• 14bfc03 Fix:comma-danglewrong autofix (fixes #6233) (#6235)
• cdd65d7 Docs: added examples for arrow-body-style (refs #5498) (#6242)
• c10c07f Fix: lost code in autofixing (refs #6233) (#6234)
• e6d5b1f Docs: Add rule deprecation section to user guide (fixes #5845) (#6201)
• 777941e Upgrade: doctrine to 1.2.2 (fixes #6121) (#6231)

There are 23 commits in total. See the full diff.

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