v2.8.0 Dependency update to fix Spotify API change

Mainly this is a small dependency updates release – we had to pin SpotifyAPI to Peter-Schorn/SpotifyAPI@e814a98 (unreleased) because we were bumping into Peter-Schorn/SpotifyAPI#59. Hopefully at some point we can go back to tracking released tags as usual.

Also spruced up build & release tooling a little. Happy listening!

Full Changelog: v2.7.1...v2.8.0