[winswitch] [ANNOUNCE] xpra-html5 v13

[Antoine Martin]

Hi,

This major update to the HTML5 client fixes some important issues, in 
particular:
* workarounds for Safari and Firefox clipboard popups, and more general 
clipboard improvements
* many fixes for file downloads, URL options, re-connection issues, etc

Updating is strongly recommended.

For more details, please see:
https://github.com/Xpra-org/xpra-html5/releases/tag/v13

Cheers,
Antoine