adds "20 Python Libraries You Aren't Using (But Should)" #50
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Description
This PR adds the Book "20 Python Libraries You Aren't Using (But Should)" to the Python Section.
Motivation and Context
"20 Python Libraries You Aren't Using (But Should)" is a collection of 20 Hidden Gems, it does not contain overly common Packages like requests but rather contains PyPI packages as well as Little-known Standard Library modules that are really Useful but are not in the general Spotlight.
Types of changes
Checklist: