This release contains only improvements for the mobile UI and therefore only contains Android builds. Users on other platforms can stay on 2.0.4.
The built-in Syncthing library was updated to 2.0.12. So be sure to read about the major changes in 2.0 on https://github.com/syncthing/syncthing/releases/tag/v2.0.12 if you are using the built-in Syncthing library.
Full Changelog: v2.0.4...v2.0.5