Migrate GitHub Action from HCL to YAML

https://help.github.com/en/articles/migrating-github-actions-from-hcl-syntax-to-yaml-syntax#converting-workflow-files-in-your-repository-to-yaml-syntax

Add more flake8 tests

flake8 —select=E9,F63,F72,F82

Use default Docker images from Python.org

@PatMyron Please try your tests of this Action again with this release.

0.1.2

Update README.md

Add workflow to README.md

0.1.1

Update README.md

Let's get started

0.1.0

Update README.md