Fix assistance request observer event

The email should only be sent when an assistance request is created
not each time it is saved.

src/Observers/AnnotationAssistanceRequestObserver.php

@@ -13,7 +13,7 @@ class AnnotationAssistanceRequestObserver
      *
      * @param Ananas $request
      */
-    public function saved(Ananas $request)
+    public function created(Ananas $request)
     {
         $request->notify(new AnanasNotification);
     }