Update snazzy to version 4.0.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

snazzy just published its new version 4.0.0, 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 snazzy – 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 4 commits .

• 1fad4f5 4.0.0
• b6fa56f standard@7
• 1057bf8 3.0.1
• fadb3ed use readable-stream (for node 0.8 support)

See the full diff.

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