setuptools is used but not declared as a setup dep

[jmcrawford45]

https://github.com/IdentityPython/pysaml2/blob/master/src/saml2/version.py uses pkg_resources which is provided by setuptools. Since this dependency isn't declared, my builds fail due to "ModuleNotFoundError: No module named 'pkg_resources'" when saml2.version is imported.

Code Version

4.6.5

Expected Behavior

No import errors

Current Behavior

Import errors

Possible Solution

Add setuptools as a dep to setup.cfg

Steps to Reproduce