Bump prettier from 1.15.2 to 1.16.4
Bump prettier from 1.15.2 to 1.16.4

Bumps [prettier](https://github.com/prettier/prettier) from 1.15.2 to 1.16.4.
- [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/1.15.2...1.16.4)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
substantial/updeep,substantial/updeep