Update README.md

Author: mmouly

decisioncenter/guicustomization/README.md

@@ -38,7 +38,7 @@ To use the sample in Decision Center, you need to build a JAR.
       
       Uninstall the ODM for Developer instance to avoid a port usage conflict if you continue this tutorial on [Docker](README-DOCKER.md) :
       ```
-      docker-compose -f compose-odm-dev.yml up down
+      docker-compose -f compose-odm-dev.yml down
       ```
 
    2. Build the JAR