CI: pin to sphinx 2.0.1 (#26727)

TomAugspurger · web-flow · commit cf25c5cd3ab1 · 2019-06-07T23:24:52.000-05:00
diff --git a/ci/deps/travis-36-doc.yaml b/ci/deps/travis-36-doc.yaml
@@ -33,7 +33,8 @@ dependencies:
   - pytz
   - scipy
   - seaborn
-  - sphinx
+  # recursion error with sphinx 2.1.0. https://github.com/pandas-dev/pandas/issues/26723
+  - sphinx==2.0.1
   - sqlalchemy
   - statsmodels
   - xarray
