Support non-LTS distributions

[jdrch]

Procmon seems to target Ubuntu 18.04 and 20.04 exclusively. Some of us, like myself, are running shorter release cycle distros. I'm asking that support be added for these too.

[MarioHewardt]

Should work just fine on the non-LTS distros, however, testing and release management is only on the LTS versions.

[jdrch]

I imagine that's the case, but the repo is configured to return packages for LTS versions only. If you install the repo on a non-LTS version, e.g. 20.10, # apt install procmon will not find any package by that name.

[MarioHewardt]

Duplicate of #70