Add graphviz as package on RTD

tekktrik · tekktrik · commit 70fe632fcbac · 2023-02-05T18:48:40.000-05:00
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
@@ -12,6 +12,8 @@ build:
   os: ubuntu-20.04
   tools:
     python: "3"
+  apt_packages:
+    - graphviz
 
 python:
   install:
