20.5
Relicense under both Apache License, v2.0 and a 2 clause BSD license
Update manylinux detection to be robust to incompatible ABIs (#221)
Add tests for new python_version logic
Fix testsuite for pytest 5.x
Deprecate LegacyVersion/LegacySpecifier (#342)
add support for macos 11.0, arm64, universal2 (#319)
Fix `canonicalize_version` to accept Version instances (#328)