Update chai requirement to 4.1.*
Update chai requirement to 4.1.*

Updates the requirements on [chai](https://github.com/chaijs/chai) to permit the latest version.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/master/History.md)
- [Commits](https://github.com/chaijs/chai/commits/4.1.2)
Idrinth/automatic-formatting,Idrinth/automatic-formatting