[winswitch] [ANNOUNCE] Xpra 3.0.4: a few fixes, one critical

[Antoine Martin]

Hi,

This update does not fix many issues, but it does fix one critical bug
that affected only the MS Windows Python 3 builds when showing
undecorated windows with OpenGL enabled.
There is no urgency to update if you were not affected by these bugs.

Release notes:
* fix missing undecorated windows on MS Windows with Python 3
* fix av-sync issues
* fix X11 property synchronization error due to race condition
* fix XI2 bindings not loading
* fix ssh upgrades wrongly claimed as supported without paramiko
* fix 'wireless' network device detection on Linux
* fix 'Sound Buffer' graph
* fix errors caused by window title error handler
* fix missing 'Packet Encoders' and 'Packet Compressors' python3 clients
* relax RPM dependencies to allow different versions to be installed
simultaneously
* add missing files to MANIFEST
* distinguish certificate verification errors from other SSL errors

Cheers,
Antoine