0.0.7

• This version introduces a new module to detect keys used in the xz backdoor. The backdoor expects a certain type of RSA public key, badkeys can detect these now. This detection can theoretically lead to false positives, however, the false positive rate is low enough (~1:2^62) that it will likely never show up in practice.
• Move from setup.py/setup.cfg to pyproject.toml.
• Avoid installing the "tests" dir in the wheel.
• Avoid open_binary() deprecation warning and use new files() API. This raises the required Python version to 3.9.