Upgrade framework

vendor/laravel/serializable-closure/src/Exceptions/PhpVersionNotSupportedException.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Laravel\SerializableClosure\Exceptions;
+
+use Exception;
+
+class PhpVersionNotSupportedException extends Exception
+{
+    /**
+     * Create a new exception instance.
+     *
+     * @param  string  $message
+     * @return void
+     */
+    public function __construct($message = 'PHP 7.3 is not supported.')
+    {
+        parent::__construct($message);
+    }
+}