Pin jinja2 to fix nbsphinx build issue

duckontheweb · duckontheweb · commit 63911a6246af · 2021-05-20T08:41:44.000-04:00
See pydata/xarray#5299
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -12,5 +12,8 @@ sphinxcontrib-fulltoc==1.2.0
 nbsphinx==0.7.1
 coverage==5.2.*
 
+# https://github.com/pydata/xarray/issues/5299#issuecomment-840730954
+jinja2<3.0
+
 # optional dependencies
 orjson==3.5.2
