Accept legacy PyPI local versions like 2.0.1rc2-git #179
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Summary
Add a safe fallback for legacy local versions that use - by normalizing to PEP 440 +.
Keep strict packaging.version.Version as the primary parser.
Add tests to cover the new behavior.
Changes
versions.py: add fallback normalization for legacy local versions.
test_pypi_version.py: new test for 2.0.1rc2-git.
test_versions.py: validate is_valid() accepts the legacy form.
Testing
pytest -q
test_pypi_version.py -q (optional)
Issue
Fixes #176