Add .readthedocs.yml config file and pin to Python v2.7. #6668
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At some point ReadTheDocs switched the default Python version from 2.7 to 3.7 causing all Cabal user guide docs to no longer build. The error surfaces as:
This PR adds a config file which pins to python 2.7, we really should just update cabaldomain.py to be compatible with Python 3.7, but that's for another day.
Verified this branch builds at: https://readthedocs.org/projects/m-renaud-haskell-cabal/builds/10780554/ (not sure if this is publicly visible or not).
Edit: after looking at https://readthedocs.org/projects/cabal/builds/, it appears the docs have built successfully, maybe there's some config in the admin panel :/ In any case, this is the more programmatic way to pin the version.