[winswitch] [ANNOUNCE] Xpra 4.0.1: a few fixes

[Antoine Martin]

Hi,

This minor update fixes just 8 bugs.
There is no urgency to update if you were not affected by these bugs.


Release notes:
* fix missing content-type for some windows
* fix GTK server crash on exit
* fix compatibility with newer versions of uglifyjs
* fix ssh session start and attach on Posix systems
* fix missing avcodec encodings with Ubuntu 18.04
* fix 'xpra send-file' to use absolute file paths
* fix MacOS shadow servers failing to accept connections
* don't depend on gnome bits if plasma-desktop is installed (.deb)

Cheers,
Antoine