upgrade to laravel 7 and set branch to v2

vendor/symfony/http-foundation/Exception/JsonException.php

@@ -0,0 +1,21 @@
+<?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\HttpFoundation\Exception;
+
+/**
+ * Thrown by Request::toArray() when the content cannot be JSON-decoded.
+ *
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
+final class JsonException extends \UnexpectedValueException implements RequestExceptionInterface
+{
+}