docs: Set minimum versions for sphinx

I saw that the 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I see exactly the same error as in sphinx-doc/sphinx#2465 and readthedocs seem to use 1.3.5, causing the pdf docs to be outdated.
Tarrasch · Jul 13, 2016 · 8eff203 · 8eff203
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diff --git a/doc/conf.py b/doc/conf.py
@@ -82,7 +82,7 @@ def _warn_node(self, msg, node, *args, **kwargs):
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
-#needs_sphinx = '1.0'
+needs_sphinx = '1.4.4'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom

diff --git a/tox.ini b/tox.ini
@@ -87,7 +87,7 @@ commands = isort -w 120 -rc luigi test examples bin
 # Call this using `tox -e docs`.
 deps =
   sqlalchemy
-  Sphinx==1.4.2
+  Sphinx>=1.4.4<1.5
   sphinx_rtd_theme
 commands =
     # build API docs