Bump prettier from 1.18.2 to 1.19.1

Bumps [prettier](https://github.com/prettier/prettier) from 1.18.2 to 1.19.1.
- [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/1.18.2...1.19.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>