Install phan/phpstan local

vendor/sabre/event/lib/PromiseAlreadyResolvedException.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabre\Event;
+
+/**
+ * This exception is thrown when the user tried to reject or fulfill a promise,
+ * after either of these actions were already performed.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PromiseAlreadyResolvedException extends \LogicException
+{
+}