No version compatible with pamqp 3.x

[risicle]

This might result in the removal of the rabbitpy package from NixOS 20.09, because we don't want to go down the rabbit hole (pun intended) of supporting multiple versions of a python package.

[gmr]

I'll take a look, that will require dropping Python 2 support. Now that Python 2 is EOL, I think we can get away with doing that.

[galuszkak]

I'm working on this as a part of Hacktoberfest. I should have Pull Request ready by end of the week.

// cc @gmr

[lmartinez-mirror]

Apologies for the necro-bump but it's worth mentioning that #127 hasn't moved in almost a year, and similarly risks being dropped from the AUR.