Update eslint to version 2.0.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

eslint just published its new version 2.0.0, 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 eslint – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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GitHub Release

• cc3a66b Docs: Issue message when more info is needed (Nicholas C. Zakas)
• 2bc40fa Docs: Simplify hierarchy of headings in rule pages (Mark Pedrotti)
• 1666254 Docs: Add note about only-whitespace rule for --fix (fixes #4774) (Burak Yigit Kaya)
• 2fa09d2 Docs: Add quotes to related section of prefer-template (fixes #5192) (Burak Yigit Kaya)
• 7b12995 Fix: key-spacing not enforcing no-space in minimum mode (fixes #5008) (Burak Yigit Kaya)
• c1c4f4d Breaking: new no-empty-function rule (fixes #5161) (Toru Nagashima)

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