use python 3.8 to build docs as rtd doesn't support 3.9 yet

hoefling · hoefling · commit 59d6db21ee53 · 2021-05-28T22:57:17.000+02:00
Signed-off-by: oleg.hoefling &lt;oleg.hoefling@gmail.com&gt;
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
@@ -4,7 +4,7 @@ sphinx:
   configuration: doc/source/conf.py
 
 python:
-  version: 3.9
+  version: 3.8
   install:
     - method: pip
       path: .
