Update dependency prettier to v1.13.4

[renovate[bot]]

This Pull Request updates dependency prettier from v1.13.3 to v1.13.4

Release Notes

### [`v1.13.4`](https://github.com/prettier/prettier/blob/master/CHANGELOG.md#​1134) [Compare Source](https://github.com/prettier/prettier/compare/1.13.3...1.13.4) [link](https://github.com/prettier/prettier/compare/1.13.3...1.13.4) - Fix a regression when printing graphql-in-js ([#​4616](`https://github.com/prettier/prettier/pull/4616`)) ---

---

This PR has been generated by Renovate Bot.

[codecov-io]

Codecov Report

Merging #10 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #10   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          29     29           
=====================================
  Hits           29     29

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 3f1efd4...d6f3dd6. Read the comment docs.

[coveralls]

Pull Request Test Coverage Report for Build 40

• 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 84.211%

---

Totals
Change from base Build 38:	0.0%
Covered Lines:	29
Relevant Lines:	29

---

💛 - Coveralls