Release notes for sbmlutils 0.4.0

Highlights

• switch from travis to github actions
• black code formating; isort import handling
• type annotations and documentations
• removed future imports and other legacy code
• refactored unittest to pytest
• cobra and optlang now optional
• cleanup of function signatures
• more comprehensive type annotations

New features

• python 3.8 support
• support and CI-CD for Mac-OS and Windows

Fixes

• fixed pep8 issues
• fixed compressed SBML loading

Deprecated features

• refactored DFBA to https://github.com/matthiaskoenig/dfba