docs: Set minimum versions for sphinx #1760
Merged
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I saw that the readthedocs build was failing, hence this is my attempt to fix it,
altough I don't know how to test this before merging it.
See https://readthedocs.org/projects/luigi/builds/4189801/
Unfortunately I couldn't find a way to connect a webhook between GitHub
PRs and readthedocs: readthedocs/readthedocs.org#1340
The reason I believe a version bump would fix it is because I see
exactly the same error as in sphinx-doc/sphinx#2465 and readthedocs
seem to use 1.3.5, causing the pdf docs to be outdated.