[winswitch] [ANNOUNCE] Xpra 6.3.4

[Antoine Martin]

Hi,

This is a more regular update to the stable branch.
The "security" issues are not terribly scary as they do not normally 
disclose much more information than is already required to access the 
session.
The random SSL disconnection bug is the most serious issue fixed in this 
release.
MacOS users also get a more polished release.

For more details, please see:
https://github.com/Xpra-org/xpra/releases/tag/v6.3.4

Cheers,
Antoine