chore(deps): update dependency prettier to v1.18.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
prettier (source)	devDependencies	minor	1.17.1 -> 1.18.0

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Release Notes

prettier/prettier

### [`v1.18.0`](https://togithub.com/prettier/prettier/blob/master/CHANGELOG.md#​1180) [Compare Source](https://togithub.com/prettier/prettier/compare/1.17.1...1.18.0) [diff](https://togithub.com/prettier/prettier/compare/1.17.1...1.18.0) 🔗 [Release Notes](https://prettier.io/blog/2019/06/06/1.18.0.html)

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[codecov[bot]]

Codecov Report

Merging #53 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #53   +/-   ##
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  Coverage     100%   100%           
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  Files           2      2           
  Lines          45     45           
  Branches       11     11           
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  Hits           45     45