First bugfixes in 2.0-series

What's Changed

• Define DEVELOP_DIST as -1 integer. by @mauritsvanrees in #59
• Update workflows and docs to use 'main' as default branch [@jensens]
• Fix uv cache configuration in CI workflows. [@jensens]

Full Changelog: v2.0.0...v2.0.1

Breaking: Modernized Package

Full Changelog: 1.8.2...v2.0.0

Breaking changes

• Drop Python 2.7 and Python 3.9 support. Require Python 3.10 or later.
  [jensens]
• Replace requests library with httpx for async HTTP support.
  [jensens]
• Convert all HTTP operations to async (requires no user code changes).
  [jensens]

New features

• 10-50x performance improvement for PyPI checks through concurrent async HTTP requests.
  [jensens]
• Add comprehensive type hints throughout the codebase (PEP 484).
  [jensens]
• Modernize build system: use pyproject.toml with setuptools backend (PEP 621).
  Changed from hatchling to setuptools for compatibility with zc.buildout develop installs.
  [jensens]
• Add upper bound version constraint for httpx dependency (httpx>=0.27,<1.0).
  This prevents installation of httpx==1.0dev3 which has breaking API changes (missing AsyncClient).
  [jensens]
• Add GitHub Actions CI/CD workflows for testing, linting, and automated releases.
  [jensens]
• Configure PyPI Trusted Publishing for secure, token-free releases.
  [jensens]
• Replace black/mypy with ruff/pyright for faster linting and type checking.
  [jensens]
• Add pre-commit configuration with ruff, isort (plone profile), and pyright.
  [jensens]
• Add concurrency control for PyPI requests (default: 20 concurrent).
  [jensens]
• Convert to PEP 420 implicit namespace packages.
  [jensens]
• Add comprehensive test coverage (pypi.py: 26 tests, utils.py: 25 tests, parser.py: 4 new tests).
  [jensens]
• Increase test coverage from 65% to 77% with better edge case testing.
  [jensens]
• Increase minimum coverage requirement from 60% to 77% in test suite.
  [jensens]
• Add separate lint and type-check jobs to CI workflow for better feedback.
  [jensens]
• Use official pyright-action for CI type checking with PR annotations.
  [jensens]

Bug fixes

• Fix invalid version handling when using packaging library.
  [jensens]
• Replace deprecated pkg_resources with packaging library.
  [jensens]