enable fail_on_warning for RTD (#4269)

keewis · web-flow · commit a198218ddabe · 2020-07-27T16:04:48.000+02:00
diff --git a/readthedocs.yml b/readthedocs.yml
@@ -7,6 +7,6 @@ conda:
     environment: ci/requirements/doc.yml
 
 sphinx:
-  fail_on_warning: false
+  fail_on_warning: true
 
 formats: []
