BUG: Temporarily pin the version of Sphinx to 3.3.1 in requirements.

shawnbrown · shawnbrown · commit 1a039185e0e3 · 2020-12-20T19:20:31.000-05:00
Currently, the CI "Build documentation" step is failing with Sphinx 3.4.0.
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -17,7 +17,7 @@ pycodestyle
 pyupgrade
 gitpython
 gitdb
-sphinx
+sphinx==3.3.1
 nbconvert>=5.4.1
 nbsphinx
 pandoc
