working on journal

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

bus/src/main/java/de/srsoftware/umbrella/messagebus/events/Event.java

@@ -5,7 +5,6 @@ import static de.srsoftware.umbrella.core.constants.Field.*;
 import static java.util.Optional.*;
 
 import de.srsoftware.tools.Diff;
-import de.srsoftware.tools.Mappable;
 import de.srsoftware.umbrella.core.model.ObjectWithId;
 import de.srsoftware.umbrella.core.model.Translatable;
 import de.srsoftware.umbrella.core.model.UmbrellaUser;