Update the README to indicate that application is only compatible with Python 3.10+

README.md

@@ -69,6 +69,8 @@ When you have completed the goals then you can open a Pull Request to this main
 
 ### Set up a virtualenv
 
+This application is compatible with Python 3.10 and later.  You can set up a virtual environment with:
+
 ```shell
 $ python3 -m venv venv
 $ source venv/bin/activate