Added commented-out method that will eventually notify of schedule changes.

dddsample/tracking/core/src/main/java/se/citerus/dddsample/tracking/core/application/event/SystemEvents.java

@@ -2,6 +2,7 @@ package se.citerus.dddsample.tracking.core.application.event;
 
 import se.citerus.dddsample.tracking.core.domain.model.cargo.Cargo;
 import se.citerus.dddsample.tracking.core.domain.model.handling.HandlingEvent;
+import se.citerus.dddsample.tracking.core.domain.model.voyage.Voyage;
 
 /**
  * This interface provides a way to let other parts
@@ -26,4 +27,7 @@ public interface SystemEvents {
    */
   void notifyOfCargoUpdate(Cargo cargo);
 
+  // TODO
+  //void notifyOfScheduleUpdate(Voyage voyage);
+
 }