There are no release notes for unreleased git master snapshots.

The upstream changelog is now part of the Handbook (manual):

	https://musescore.org/en/handbook/developers-handbook/release-notes/release-notes-musescore-3x/release-notes-musescore-322

Previous release notes can be found here:

	https://musescore.org/en/handbook/developers-handbook/release-notes
