Update hoek to version 4.0.0 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

hoek 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 hoek – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 18 commits .

• 6c18f05 4.0.0
• e4554e9 docs
• 26a344d update doc format
• 07abda1 respect separator option for transform keys, closes #124
• 002228c update lab, closes #186
• 517e4e6 Merge pull request #180 from gdi2290/patch-1
• 5a2e384 Merge pull request #185 from catalint/master
• 8711711 Merge pull request #183 from simon-p-r/assert-string
• 8e83b0b Merge pull request #181 from simon-p-r/absolutePath
• ae706c7 added more tests for unique, check for same result with deprecated version
• d01f254 improve .unique to make use of es6Setperformance
• d1a9de5 fix for issue #177
• f62961d Merge pull request #182 from simon-p-r/uniqueFilename-tests
• 888f732 fixed broken uniqueFilename tests on Windows
• 3db167f removed isAbsolutePath method

There are 18 commits in total. See the full diff.

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