1.1.3 Incorrectly Reports Python 3.5+/3.7+, But Package Is Python 3.8+

[adzyh]

We noticed that version 1.1.3 has a setup.py that specifies Python 3.5+ :

python_requires='>3.5',

In addition, the README prerequisites state:

Python 3.7 or newer. Use of Python versions 3.6 or older are not supported.

However, secret_cache.py now uses importlib.metadata, which was introduced in Python 3.8: https://docs.python.org/3/library/importlib.metadata.html#module-importlib.metadata

Can we have the documentation/setup updated in 1.1.3 to reflect this ? Thanks!