Hey @Flanstario1, welcome to the Community.
Hope you're doing great!
There's no change log to indicate what has exactly been changed, usually there are just the regular bug fixes and general improvements.
However, if you are testing the new Desktop UX/UI refer to this post here for changes that might be done on select updates.
Hope that helps 🙂
Help others find this answer and click "Accept as Solution".
If you appreciate my answer, maybe give me a Like.
Note: I'm not a Spotify employee.