Issue #520 - Fixing issue where reason codes were not returned for Publish Acks

Signed-off-by: James Sutton <james.sutton@uk.ibm.com>

Author: jpwsutton

org.eclipse.paho.mqttv5.client/src/main/java/org/eclipse/paho/mqttv5/client/MqttToken.java

@@ -108,7 +108,7 @@ public MqttProperties getMessageProperties() {
 
 	@Override
 	public int[] getReasonCodes() {
-		return internalTok.getWireMessage().getReasonCodes();
+		return internalTok.getReasonCodes();
 	}
 
 }