py-release setuptools / bumpmyversion bugs

Describe the bug

Release step fails when using setuptools build system.

the problem is mainly in the py_release() function :

elif [[ -f ".bumpversion.cfg" ]] and the following code does not work because bumpmyversion uses exclusively .toml files now and exits on error with the .cfg file

default case py_cur_version=$(python setup.py --version) fails because setuptools is not installed

I recommend to at least change the .bumpversion.cfg to .bumpversion.toml.

Expected behavior

release is built

Actual behavior

does not work

Thanks, to be continuous is great !