Fails to install on Python 3.9

[jaraco]

I was upgrading my pipx-managed commands today for Python 3.9 when vendoring failed to install.

~ $ pip -V
pip 20.2.3 from /Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pip (python 3.9)
~ $ pip install vendoring
ERROR: Could not find a version that satisfies the requirement vendoring
ERROR: No matching distribution found for vendoring

[pradyunsg]

AHA. It's due to the ~= 3.8.0 in the project's Python-Requires. Just a case of me being overly cautious.

[McSinyx]

cross-linking pypa/pip#8971 so that it can be seen from there when this is fixed

[pradyunsg]

Fixed and released as 0.3.3.