Bump prettier from 2.1.2 to 2.2.0 (#433)

Bumps [prettier](https://github.com/prettier/prettier) from 2.1.2 to 2.2.0.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/prettier@2.1.2...2.2.0)

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