pin matplotlib in ci/requirements/doc.yml (#4340)

mathause · web-flow · commit 3b5a8ee46be7 · 2020-08-15T01:11:25.000+02:00
* add matplotlib to ci/requirements/doc.yml

* pin matplotlib to 3.3.0
diff --git a/ci/requirements/doc.yml b/ci/requirements/doc.yml
@@ -13,6 +13,7 @@ dependencies:
   - ipython
   - iris>=2.3
   - jupyter_client
+  - matplotlib-base=3.3.0
   - nbsphinx
   - netcdf4>=1.5
   - numba
