Update prettier requirement to 1.10.*
Update prettier requirement to 1.10.*

Updates the requirements on [prettier](https://github.com/prettier/prettier) to permit the latest version.
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/commits/1.10.2)
Idrinth/automatic-formatting,Idrinth/automatic-formatting