Release wheels only for python 3.6+

[gavincyi]

Since setuptools 51.0.0, #2435 has dropped the support of python version 3.5 or lower. However the wheel is named in python 3 generic version setuptools-51.0.0-py3-none-any.whl . Is it possible to release only python 3.6+ wheels so that the older version will pick up the version 50.3.2 for compatibility?

[gavincyi]

Just checked the latest pip should help choose the right version on the python compatibility. Not an issue anymore.

[gavincyi]

For more details, the older pip, e.g. pip 9.0.3, failed to parse the data-requires-python in PEP-503. After upgrading the pip version, the latest setuptools installed in, for example Python 3.5, is 50.3.2 at the moment.