add matplotlib in rtd build

MatthewSZhang · MatthewSZhang · commit a22e0365586a · 2025-10-02T11:19:12.000+08:00
diff --git a/rtd-environment.yml b/rtd-environment.yml
@@ -10,6 +10,7 @@ dependencies:
   - sphinxcontrib-plantuml
   - jupyterlite-sphinx
   - plantuml
+  - matplotlib
   - pip:
       - .
       - jupyterlite-xeus
