0.20.0

• Add pyupgrade (Python >= 3.8) to pre-commit config.
• Add Django 4.2 support and drop Django 2.2 support.
• Add django-upgrade (Django >= 3.2) to pre-commit hooks.
• Add metadata module.
• Add locales support.
• Add string primary key support. #81
• Fix XSS vulnerability in get_display_text method.
• Replace str.format with f-string.
• Replace flake8 with Ruff.
• Replace setup.py in favor of pyproject.toml.
• Run pre-commit also with tox.
• Pin test requirements.
• Bump requirements and pre-commit hooks.
• Rename default branch from master to main.