updating kanban on

* task creation
* task update
* task deletion

frontend/src/urls.svelte.js

@@ -15,9 +15,11 @@ export function drop(url){
     });
 }
 
-export function eventStream(updateHandler){
+export function eventStream(createHandler,updateHandler,deleteHandler){
 	const es = new EventSource(api('bus'), {withCredentials: true});
+	if (createHandler) es.addEventListener('CREATE', createHandler);
 	if (updateHandler) es.addEventListener('UPDATE', updateHandler);
+	if (deleteHandler) es.addEventListener('DELETE', deleteHandler);
 	return es;
 }