Fix disabled Pyenv versions breaking the script (#66)
Fix disabled Pyenv versions breaking the script (#66)

Closes https://github.com/pantsbuild/setup/issues/62.

A frequent idiom with Python development is to use Pyenv to globally install several Python versions, but to only activate certain versions locally. This would break the `./pants` script, as it would think that an un-activated version like `python3.8` was valid when really it would fail when being run.
jsirois/setup,pantsbuild/setup,jsirois/setup,pantsbuild/setup,pantsbuild/setup,jsirois/setup