Change minimum Python version

[thiagokokada]

This project seems like a nice and simple wrapper compared to others I found in PyPI.

The only issue is that the minimum Python version is set too high (3.9.2). Looking at the code there isn't anything obvious that the minimum version couldn't be lower like ^3.8 or even ^3.7. Or if 3.9 is a must, it could be at least ^3.9 (so it doesn't force someone to have the patched version). Anything lower than 3.7 probably isn't worth it supporting since they're EOL.

Can this be done?

[thiagokokada]

CC @samedamci.