Major changes
Upgrade Tor Browser to 9.0.4-build1 (MFSA-2020-03)
Bugfixes
Avoid the Upgrader proposing to upgrade to the version
that's already running (Closes: #17425)
Avoid 2 minutes delay while rebooting after applying an automatic
upgrade (Closes: #17026)
Make Thunderbird support TLS 1.3 (Closes: #17333)
Build system
IUK generation: don't make all files in the SquashFS diff
owned by root, otherwise an upgraded system cannot start
(Closes: #17422)