fix rtd to use python=3.8 (#590)

mmcky · web-flow · commit 7ffc61b70f86 · 2021-11-11T13:40:03.000+11:00
diff --git a/readthedocs.yml b/readthedocs.yml
@@ -4,7 +4,7 @@ build:
   image: latest
 
 python:
-  version: 3.6
+  version: 3.8
   setup_py_install: true
 
 requirements_file: rtd-requirements.txt
