Update travis with release version info (#1045)

Author: bhavyahem

.travis.yml

@@ -27,7 +27,7 @@ env:
   global:
     - MAIN_BRANCH=v9.4.0
     - TAGCACHE_FILE=tagcache
-    - RELEASE=r2
+    - RELEASE=r3
     - BASE_MQ_LOCKED=true
 
 go_import_path: "github.com/ibm-messaging/mq-container"