Update classnames to version 2.2.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

classnames just published its new version 2.2.0, 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 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 14 commits .

• 34226ab v2.2.0
• 1eb545e Updating changelog
• bfdde35 Adding "Usage with React.js" guide, fixes #43
• 84fccf8 Adding usage docs for bind variant
• 8c9627d Simplifying dedupe documentation
• 1b9b99b Fixing indentation & standards in tests
• 13508c7 Merge pull request #57 from blia/bind
• 5aeeac5 unit tests
• 9d3a764 add original func
• 296d6d9 move bind ext to separate file
• 8398f0f README: indentation fix
• 62a54ab Merge pull request #58 from monners/docs-update
• 0dbba7a Update readme to include string key in object notation to demonstrate possibility of hyphenated class names
• ddb7f24 Added context for use with bind

See the full diff.

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