Pin sphinx similarly to dask-examples

jrbourbeau · jrbourbeau · commit 1f603a72e113 · 2020-02-28T15:07:00.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -29,7 +29,7 @@ install:
     - conda install -c conda-forge nbconvert nbformat jupyter_client ipykernel
 
     # Install documentation dependencies
-    - pip install nbsphinx==0.5.0 dask-sphinx-theme
+    - pip install nbsphinx dask-sphinx-theme sphinx==2.3.1
 
 script:
     - set -e
