update CHANGELOG

Author: ibmmqmet

CHANGELOG.md

@@ -5,6 +5,7 @@ Newest updates are at the top of this file.
 * Update to MQ 9.3.3
 * Update Dockerfile to support platforms without Redist client (#209)
 * Update all vendored dependencies
+* Add a waitInterval config option (#227)
 
 ### Feb 17 2023 (v5.4.0)
 * Update to MQ 9.3.2