Update classnames to version 2.2.3 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

classnames just published its new version 2.2.3, 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 classnames – 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 20 commits .

• a6934cd v2.2.3
• 5dd3fc6 Updating changelog
• 61cd79d Updating bind variant to also use [].join(' ')
• 57fb9b8 v2.2.2
• 113a559 Updating changelog
• 16ddaa6 Updating license & copyright for 2016
• 97cffbf Merge pull request #50 from JedWatson/36rebased
• 2ed7526 Merge pull request #67 from nkbt/fix-bower-main
• a7637c1 Merge pull request #66 from nkbt/npmignore
• 0b8f0a3 Add all endpoints to the bower main section
• 3a1e520 Better .npmignore
• c4aa3c7 Merge pull request #64 from JohnAGill/add-falsey-example
• 65bef1e Added falsey example
• 3d69546 Fixing whitespace issues in polyfills docs
• 0e653a0 Expanding and clarifying ES2015 dynamic keys docs

There are 20 commits in total. See the full diff.

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