Update postcss-value-parser to the latest version 🚀

[greenkeeper]

The dependency postcss-value-parser was updated from 3.3.1 to 4.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Release Notes for v4.0.0

4.0.0 (2019-06-04)

Fixes

• Respect whitespace in empty url function
• Invalidate values starting with 'e' + digit

Features

• Allow certain calc() operations to be parsed according to the spec
• New unicode range node

BREAKING CHANGE

• minimum supported node version is 8

Commits

The new version differs by 6 commits.

• 79294f7 chore(release): 4.0.0 (#51)
• 852c111 ci: node@12 (#50)
• 7867d1f fix: invalidate values starting with 'e' + digit (#49)
• 3696841 feat: support unicode range node (#45)
• a86f64b fix: empty url with whitespace characters (#44)
• d579b64 feat: allow certain calc() operations to be parsed according to the spec (#42)

See the full diff

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Your Greenkeeper bot 🌴

[coveralls]

Coverage remained the same at 88.571% when pulling e8f391a on greenkeeper/postcss-value-parser-4.0.0 into 9d8a971 on master.