Changed python version to 3.8

Author: victorprincipe

.readthedocs.yaml

@@ -15,7 +15,7 @@ formats:
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.7
+  version: 3.8
   install:
     - requirements: docs/requirements.txt
     - method: pip