Composer update

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

vendor/psy/psysh/test/Formatter/Fixtures/SomeClass.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2018 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Test\Formatter\Fixtures;
+
+class SomeClass
+{
+    const SOME_CONST = 'some const';
+    private $someProp = 'some prop';
+
+    public function someMethod($someParam)
+    {
+        return 'some method';
+    }
+
+    public static function someClosure()
+    {
+        return function () {
+            return 'some closure';
+        };
+    }
+}