add entity-revision header

Author: hu-ahmed

things/service/src/main/java/org/eclipse/ditto/things/service/persistence/actors/strategies/commands/MigrateThingDefinitionStrategy.java

@@ -163,7 +163,7 @@ private Result<ThingEvent<?>> handleMigrateDefinition(
 
         final CompletionStage<WithDittoHeaders> responseStage = validatedStage.thenApply(pair ->
                 appendETagHeaderIfProvided(command, MigrateThingDefinitionResponse.applied(context.getState(),
-                                pair.first().toJson(), dittoHeaders),
+                                pair.first().toJson(), createCommandResponseDittoHeaders(dittoHeaders, nextRevision)),
                         pair.first()));
 
         return ResultFactory.newMutationResult(command, eventStage, responseStage);