Added 3.11 & 3.12 to GitHub actions

Added GZip feature in README

Added sarimak to contributors

Markdown README is now the main one

Added a manifest.in file

See #36
Also added a small version bump as it is a metadata-only change

Added missing packages in setup.py

Re-format with black

Version bump to 0.2.4

Updated README

Version bump: 0.2.2