Update README.md

Author: sophiegreen

append-char-container-sample/README.md

@@ -5,6 +5,6 @@ This sample shows how you can use the JCICSX API to create a channel containing
 ## Pre-reqs
 
 * CICS TS V5.6 or later
-* Java SE 1.7 or later on the z/OS system
-* Java SE 1.7 or later on the workstation
+* Java SE 1.8 or later on the z/OS system
+* Java SE 1.8 or later on the workstation