devel/py-virtualenv: Update to 20.30.0
- Enable DOCS option again, after the incompatibility between textproc/py-towncrier and textproc/py-sphinxcontrib-towncrier (two docs dependencies) has been solved. See
https://github.com/sphinx-contrib/sphinxcontrib-towncrier/issues/92
Release changes: https://github.com/pypa/virtualenv/releases/tag/20.30.0
Reported by: Bernát Gábor <notifications@github.com>