Readme updates.

Author: AndyMc629

Chapter03/automl/README.md

@@ -1,7 +1,7 @@
 # Autosklearn example
 There are known issues around installing auto-sklearn on MacOS and Windows systems so I have set this up to run in a docker container.
 
-To run this example just run the following:
+To run this example just run the following (this assumes you have already run ```conda env create -f mlewp-chapter03.yml```):
 
 ```bash
 docker build -t autosklearn .