chore: document support for Python 3.11 and 3.12

fix: test runner exit code

fix: move HelloGithub badge on its own line and remove Codacy badge

fix: HelloGithub badge as raw HTML

chore: add HelloGithub badge

docs: add SECURITY.md

docs: clarify multi-value behavior of --exclude/--ignore CLI options (#254)

fix: add radon CLI script to pyproject.toml (#250)

fix: test_ipynb.py on Windows by using os.path.join (#246)

docs: update max Python version in README.rst (#245)

chore: add ReadTheDocs configuration file

chore(docs): fix typos (#242)

chore(release): bump to v6.0.1

fix: tomllib name error when not supported

chore(release): bump to v6.0.0