#66 Current versions show as Python 2 compatible when they're not

[Jason R. Coombs]

The PyX project fails to install on Python 2:

pipx docs/console-scripts $ python2.7 -m pip install pyx                                                                                                                       
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
Collecting pyx
  Using cached https://files.pythonhosted.org/packages/b4/a0/75d9d39bbd0bcd3aac7bf909b1c356188734a865552607a8c6bba3bf30bd/PyX-0.14.1.tar.gz
Files/directories not found in /private/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/pip-install-UFvJeE/pyx/pip-egg-info

This issue could be avoided if the releases that require Python 3 support were re-released with 'python_requires' directives in the release (and those without were pulled).

I'd like to help with this issue and help downstream consumers avoid issues like these: https://github.com/pypa/setuptools/pull/1743#issuecomment-482987103