Update .readthedocs.yaml

Author: mchav

.readthedocs.yaml

@@ -17,6 +17,6 @@ sphinx:
 # Optionally, but recommended,
 # declare the Python requirements required to build your documentation
 # See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
-# python:
+python:
    install:
    - requirements: docs/requirements.txt