The dev lost the signing key, you will have to un- & re-install to update from 1.8.2 or below. F-Droid & IzzyOnDroid have verified to their best abilities this change should be legit, see https://github.com/JustDeax/ComposeStopwatch/issues/4

Find the dev's notes at https://justdeax.github.io/ComposeStopwatch/key-rotation

- Added settings dialog, more settings!
- Added vibration enable
- Added autostart enable
- Added themed icon
- Changed minimum android
- Improved and faster stopwatch saving
