Bumps [prettier](https://github.com/prettier/prettier) from 1.8.2 to 2.1.2.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/1.8.2...2.1.2)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>