Merge pull request #455 from afuetterer/python3

Merge pull request #463 from afuetterer/readme

chore: update code blocks in readme

remove unnecessary pyyaml dep to make tests pass

fix merge conficts

unicode_string

style: remove obsolete source encoding

remove sys.version_info

style: sort import statements using ruff

Merge pull request #454 from afuetterer/ci

Merge pull request #459 from afuetterer/new-tests

Merge pull request #460 from afuetterer/detector-tests

Merge pull request #462 from afuetterer/test-pdf

Merge pull request #453 from afuetterer/test

ci: test multiple python versions with parallel coverage uploads