1.0.0 is 3 years old and fails to build against python 3.9.
Fetch from github rather than pypi; the pypi release lacks supporting
files that are required to run the test suite.
This package is required since Gajim version 1.1.0 and I intentionally
didn't set meta.maintainers because I'm not going to be able to maintain
this package, except if Gajim requires a newer version.
Signed-off-by: aszlig <aszlig@nix.build>