removed leading backslash; set autoload of class_exists to false

Author: docteurklein

autoload.php

@@ -1,6 +1,8 @@
 <?php
 
-require_once __DIR__.'/vendor/Symfony/Component/ClassLoader/UniversalClassLoader.php';
+if (false === class_exists('Symfony\Component\ClassLoader\UniversalClassLoader', false)) {
+    require_once __DIR__.'/vendor/Symfony/Component/ClassLoader/UniversalClassLoader.php';
+}
 
 use Symfony\Component\ClassLoader\UniversalClassLoader;