This version is mainly a bugfix release. It also adds a few smaller improvements and features:
Set an individual ringtone for each contact
Set password for key revocation directly from within the app. If your ID gets lost or stolen simply revoke it on https://myid.threema.ch/revoke
Widget to display unread messages on desktop or lock screen
Bug fixes and improvements
The voice message plugin was also updated to 1.1. It now allows you to preview recorded voice messages before sending them.
