Bump NUnit from 3.11.0 to 3.12.0 (#345)
Bump NUnit from 3.11.0 to 3.12.0 (#345)

Bumps [NUnit](https://github.com/nunit/nunit) from 3.11.0 to 3.12.0.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/master/CHANGES.md)
- [Commits](https://github.com/nunit/nunit/compare/v3.11...v3.12)
JohnnyCrazy/SpotifyAPI-NET,JohnnyCrazy/SpotifyAPI-NET,JohnnyCrazy/SpotifyAPI-NET,JohnnyCrazy/SpotifyAPI-NET