Helps pip decide what version of the library to install.
https://packaging.python.org/tutorials/distributing-packages/#python-requires
> If your project only runs on certain Python versions, setting the
> python_requires argument to the appropriate PEP 440 version specifier
> string will prevent pip from installing the project on other Python
> versions.
https://setuptools.readthedocs.io/en/latest/setuptools.html#new-and-changed-setup-keywords
> python_requires
>
> A string corresponding to a version specifier (as defined in PEP 440)
> for the Python version, used to specify the Requires-Python defined in
> PEP 345.