0.4.0

Added

• err command-line tool.
• BaseFormatter abstract base class.
• TerseFormatter and ExtendFormatter formatters.
• ErrorInfo got optional root_module field.
• ErrorInfo.get_top_app_frame() function.
• py.typed file for PEP-561 compatibility
• docs: "Supported standards" page

Changed

• docs: Code Quality
• Refined docstrigs

Infrastructure

• Use actions/checkout@v3
• Use actions/cache@v3
• Use pypa/gh-action-pypi-publish@release/v1
• Project structure tests
• CI workflows tests
• Adopt Ruff
• Coverage 7.3.0
• mypy 1.5.1
• Move .coveragerc to pyproject.toml
• Move setup.cfg to pyproject.toml