Add type annotations + some modernization

Yelp / swagger_spec_validator

Other

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Closed kaisen closed 1 year ago

kaisen commented 1 year ago

Add type annotations
- This required https://github.com/python/typeshed/pull/8898
Drop simplejson
Drop py2/py35/py36 and run tests for py37/py38,
Format with black

Tests pass (including mypy)