Remove the vendor directory in .gitignore as these dependencies are needed for php-imap

plugins/php-imap/vendor/illuminate/contracts/Queue/ClearableQueue.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Illuminate\Contracts\Queue;
+
+interface ClearableQueue
+{
+    /**
+     * Delete all of the jobs from the queue.
+     *
+     * @param  string  $queue
+     * @return int
+     */
+    public function clear($queue);
+}