Update radium to version 0.16.6 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

radium just published its new version 0.16.6, 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 radium – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 148 commits .

• dbbbf67 0.16.6
• ddd6bb2 Merge pull request #568 from williamboman/style/editorconfig
• e535918 Merge pull request #569 from williamboman/docs/spread-operator
• db64951 examples: add spread operator tip
• 202116c add .editorconfig
• f036c23 Simplify isPlainObject check, remove dependency
• 47472b9 0.16.5
• a82c8ea Changelog for v0.16.5
• 87457d0 Add visited-plugin
• 23ae851 Move appendImportantToEachValue and hash into PluginConfig
• d0b3289 [Prefix] Add an option to prefix for all user agent
• 99b4508 Merge pull request #555 from FormidableLabs/greenkeeper-lodash-4.0.1
• da3b2c6 Use lodash.merge instead
• 4e39ffe Don't add className if empty
• 49ed5ab Fix lint and tests after media query change

There are 148 commits in total. See the full diff.

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