Update README.md

Minor clarification.

Author: gilesgas

Diff for: README.md

@@ -11,4 +11,4 @@ check that the application renders satisfactorily.
 The `jenkins` directory contains an example of the `Jenkinsfile` (i.e. Pipeline)
 you'll be creating yourself during the tutorial and the `scripts` subdirectory
 contains shell scripts with commands that are executed when Jenkins processes
-the "Deliver" stage of your Pipeline.
+the "Test" and "Deliver" stages of your Pipeline.