Fixed readthedoc build

JohanMabille · JohanMabille · commit e3b7817b1df2 · 2021-10-14T01:05:28.000+02:00
diff --git a/docs/environment.yml b/docs/environment.yml
@@ -5,3 +5,4 @@ channels:
 
 dependencies:
   - breathe==4.25.1
+  - doxygen==1.9.1
