[v6] Test version matching against univers

[prabhu]

https://github.com/nexB/univers

[prabhu]

Looks like univers is doing well.

>>> from univers.versions import * 
>>> a=DebianVersion("1.1.0j-1~deb9u1")
>>> b=DebianVersion("1.1.0f-3+deb9u1")
>>> a>b
True
>>> b>a
False

>>> c = DebianVersion("20210119~20.04.2")
>>> d = DebianVersion("20211016ubuntu0.20.04.1")
>>> c>d
False
>>> d>c
True