Require attrs==19.1
@@ -33,5 +33,5 @@ matrix:
apt_packages:
- pandoc
python: "3.6"
- install: pip install IPython ipykernel sphinx sphinx_rtd_theme nbsphinx m2r
+ install: pip install IPython ipykernel sphinx sphinx_rtd_theme nbsphinx m2r attrs==19.1
script: python setup.py build_sphinx
