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

plugins/php-imap/vendor/symfony/translation/Exception/MissingRequiredOptionException.php

@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Translation\Exception;
+
+/**
+ * @author Oskar Stark <oskarstark@googlemail.com>
+ */
+class MissingRequiredOptionException extends IncompleteDsnException
+{
+    public function __construct(string $option, ?string $dsn = null, ?\Throwable $previous = null)
+    {
+        $message = sprintf('The option "%s" is required but missing.', $option);
+
+        parent::__construct($message, $dsn, $previous);
+    }
+}