Update requirements-docs.txt

Nicolas Legrand · web-flow · commit c5c4ba39b012 · 2023-02-03T11:41:40.000+01:00
diff --git a/requirements-docs.txt b/requirements-docs.txt
@@ -9,4 +9,5 @@ sphinx==5.3.0
 numpydoc>=1.4.0
 myst-parser
 pingouin
-bokeh==2.4.3
+bokeh==2.4.3
+graphviz
