fixed reference to composer autoload.php that wasn't working when run…

…ning php public/index.php from the docker container terminal

public/index.php

@@ -1,7 +1,7 @@
 <?php
 declare(strict_types=1);
 
-require '../vendor/autoload.php';
+require_once __DIR__ . '/../vendor/autoload.php';
 
 use illmatix\RandomSequence\SequenceGenerator;