Update Java prereqs

Author: PhilWakelin

cics-java-liberty-restapp/README.md

@@ -30,7 +30,6 @@ Download and compile the supplied COBOL program EDUCHAN and deploy into CICS.
 ## Pre-reqs
 
 * CICS TS V5.6 or later
-* Java SE 1.8 or later on the z/OS system
 * Java SE 1.8 or later on the workstation