Add python version requirement on setup.py #595
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Problem:
All python versions previous to 3.8 are now end of life and no longer supported.
But, pip automatically installs the latest version of flask_restx on python 3.6 (or any version under 3.8), resulting in ModuleNotFoundError on importlib.metadata which is available starting with python 3.8.
Solution:
include python_requires option when setup for pip to resolve python dependency accordingly.
prevent installing the latest and unsupported flask_restx regardless of python version.
fixes #586