increase minimum version to 3.7 for readthedocs

diff --git a/.readthedocs.yml b/.readthedocs.yml
index 009c8733c7014146cb6e2ef1e45495fca194f0ec..65357846fed8c9f1822c5cb40a2c1555f8971549 100644 (file)
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,7 +6,7 @@ sphinx:
 formats: []
 
 python:
-  version: 3.6
+  version: 3.7
   install:
     - requirements: doc/requirements.txt
     - method: pip