Fix Sphinx conf

Add readthedocs config

Link CDK matchers library

PyCharm config

Add ruff as dev dependency

Repalce Travis with Github Actions

Merge pull request #66 from eferro/master

Removed deprecate versions

Added newer python versions

Fix example

Fix build

Remove python 2.7 support

Ignore local venv

Fix Python 3.8 warning (fixes #63)

Fix format