v0.3.0

Added

• To get a repository URL, support more sources in pyproject.toml and setup.cfg.
• suggest_constraint command to suggest a new maximum version constraint for a
  dependency.

Fixed

• Support [dependency-groups] in pyproject.toml by upgrading to
  pyproject-parser 0.13.0b1.
• Ignore the github-actions user for issues, discussions and comments in
  darkgray_collect_contributors.

Removed

• Support for Python 3.8. We now support all versions 3.9 and up.

Internal

• Add a pre-commit workflow.