Composer update

* updated Laravel to v5.6.38
* Added laravel tinker in dev dependencies

vendor/psy/psysh/test/fixtures/project/.psysh.php

@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Psy Shell
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+return array(
+    'useReadline'       => false,
+    'usePcntl'          => true,
+    'requireSemicolons' => true,
+    'useUnicode'        => false,
+);