fix path to vendor autoloader

Author: rnicholus

endpoint-cors.php

@@ -22,7 +22,7 @@
  * If you need to install the AWS SDK, see http://docs.aws.amazon.com/aws-sdk-php-2/guide/latest/installation.html.
  */
 
-require 'vendor/autoload.php';
+require '../../autoload.php';
 use Aws\S3\S3Client;
 
 // These assume you have the associated AWS keys stored in