Publishing argmin-testfunctions-py: Project description missing

[stefan-k]

After publishing 0.3.0 of argmin-testfunctions-py, the project description is missing on PyPI: https://pypi.org/project/argmin-testfunctions-py/

[GermanHeim]

I believe that this is due to the pyproject.toml not having a readme field. See pola-rs pyproject.toml for reference.