added php download of membershipments

vendor/illuminate/contracts/Queue/QueueableCollection.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Illuminate\Contracts\Queue;
+
+interface QueueableCollection
+{
+    /**
+     * Get the type of the entities being queued.
+     *
+     * @return string|null
+     */
+    public function getQueueableClass();
+
+    /**
+     * Get the identifiers for all of the entities.
+     *
+     * @return array
+     */
+    public function getQueueableIds();
+
+    /**
+     * Get the relationships of the entities being queued.
+     *
+     * @return array
+     */
+    public function getQueueableRelations();
+
+    /**
+     * Get the connection of the entities being queued.
+     *
+     * @return string|null
+     */
+    public function getQueueableConnection();
+}