setup: update python_requires to comply with PEP 345/440 #388
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According to PEP 345 Requires-Python, the value of this field must be a valid Version Specifier. Which in turn expects this to comply with PEP 440.
While not an issue for those that directly use
pip
, this will cause issues forpoetry
users in the next release (if their current stance is maintained). Discussion of the issue and there stance can be found here: python-poetry/poetry#4095.resolves #387