add missing @since annotations

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

lib/public/WorkflowEngine/IEntityAware.php

@@ -24,7 +24,13 @@ declare(strict_types=1);
 
 namespace OCP\WorkflowEngine;
 
-
+/**
+ * Interface IEntityAware
+ *
+ * @package OCP\WorkflowEngine
+ *
+ * @since 18.0.0
+ */
 interface IEntityAware {
 	/**
 	 * @param object $entity

lib/public/WorkflowEngine/IEntityEvent.php

@@ -30,6 +30,8 @@ namespace OCP\WorkflowEngine;
  * represents an entitiy event that is dispatched via EventDispatcher
  *
  * @package OCP\WorkflowEngine
+ *
+ * @since 18.0.0
  */
 interface IEntityEvent {
 	/**