Update eslint-config-prettier to the latest version 🚀

[greenkeeper]

The devDependency eslint-config-prettier was updated from 5.1.0 to 6.0.0.

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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[CLAassistant]

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[coveralls]

Pull Request Test Coverage Report for Build 895

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 878:	0.0%
Covered Lines:	256
Relevant Lines:	256

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💛 - Coveralls

[codecov]

Codecov Report

Merging #143 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #143   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines         256    256           
=====================================
  Hits          256    256

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