Bug#922726: conserver: Update debian/watch file to watch github page for new released versions

[Salvatore Bonaccorso]

Source: conserver
Version: 8.2.1-1
Severity: minor
Tags: patch

Hi,

conserver releases can be found on https://github/conserver/conserver
so the debian/watch file can monitor new upstream releases on the
GitHub page for conserver.

Regards,
Salvatore