activated virtual environment in readthedocs

.readthedocs.yml

@@ -16,11 +16,11 @@ sphinx:
 # Optionally build your docs in additional formats such as PDF and ePub
 formats: all
 
-## Optionally set the version of Python and requirements required to build your docs
-#python:
-#  version: 3.7
-#  install:
-#    - requirements: docs/requirements.txt
-#    # Install package using pip for the build (needed for autodoc)
-#    - method: pip
-#        path: .
+# Optionally set the version of Python and requirements required to build your docs
+python:
+  version: 3.7
+  install:
+    - requirements: docs/requirements.txt
+    # Install package using pip for the build (needed for autodoc)
+    - method: pip
+        path: .