Update dependency prettier to v1.13.6

[renovate]

This Pull Request updates dependency prettier from v1.13.3 to v1.13.6

Release Notes

v1.13.6

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• Upgrade Flow parser to 0.75.0 (#​4649 and #​4727)
• Preserve type parameters of import-types in TypeScript (#​4662)
• Preserve parens for type casting for sub-item (#​4648)

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v1.13.5

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• Better handling of trailing spaces in Markdown (#​4593)
• Fix empty file error in JSON and GraphQL (#​4553)
• Preserve decorator on TypeScript interfaces (#​4632)
• Inline _ or $ in the root of a method chain (#​4621)

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v1.13.4

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• Fix a regression when printing graphql-in-js (#​4616)

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This PR has been generated by Renovate Bot.

[codecov]

Codecov Report

Merging #235 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #235   +/-   ##
======================================
  Coverage    91.7%   91.7%           
======================================
  Files          18      18           
  Lines         410     410           
  Branches       77      77           
======================================
  Hits          376     376           
  Misses         18      18           
  Partials       16      16

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[KevinGrandon]

!merge