Update standard to version 6.0.6 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

standard just published its new version 6.0.6, 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 :palm_tree:

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The new version differs by 309 commits .

• 0d59a3d 6.0.6
• 2776708 bump standard-engine to 3.3.0 minimum
• 2be47e2 Merge pull request #427 from feross/fix-snazzy-8
• e436970 Merge pull request #420 from feross/greenkeeper-eslint-2.1.0
• 9ccab07 Merge pull request #422 from feross/greenkeeper-babel-eslint-5.0.0
• 1dac937 Use install location of standard as eslintcwd``
• 72befa0 chore(package): update babel-eslint to version 5.0.0
• 480e6ec Revert "doc: npm install RC version of eslint (fix #409)"
• 42b6130 chore(package): update eslint to version 2.1.0
• 5fd4f0f 6.0.5
• f924c20 Merge pull request #418 from feross/greenkeeper-eslint-2.0.0
• 8e9145c chore(package): update eslint to version 2.0.0
• c79c9df Fix broken link
• 9ae510b 6.0.4
• 10c3b1d update changelog

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

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