improves metadata from pyproject.toml

[maurerle]

Summary of the discussion

improves metadata from pyproject.toml

• supported python versions are implicitly generated from requires-python
• license identifier makes license better visible, as it uses the common term on the https://pypi.org/project/open-mastr/ page.

Workflow checklist

PR-Assignee

• 🐙 Follow the workflow in CONTRIBUTING.md
• 📝 Update the CHANGELOG.md
• 📙 Update the documentation

Reviewer

• 🐙 Follow the Reviewer Guidelines
• 🐙 Provided feedback and show sufficient appreciation for the work done

[FlorianK13]

Thanks @maurerle for this PR. We were not too familiar with the pyproject.toml syntax when we recently replaced our setup.py, so these simplifications look great. I'll test it within this week.

[FlorianK13]

Tests are failing since API credentials are not provided for PRs coming from outside. I will merge anyway and rely on the tests that run before the next release.