Update dependency prettier to ^1.18.2

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
prettier (source)	devDependencies	patch	^1.18.2	homepage, source

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Release Notes

prettier/prettier

v1.18.2

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• TypeScript: only add trailing commas in tuples for --trailing-comma=all ([#​6199] by [@​duailibe])

  In Prettier 1.18 we added trailing commas in tuples when --trailing-comma=all, but it was also adding for --trailing-comma=es5.

  [#​6199]: #​6199

  [@​duailibe]: https://github.com/duailibe

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