Bug fix: Drupal8 utils not working

The Drupal8 framework setting hadn't been working for quite a while.

PR 50 already fixed part of this by adding the namespace, but as the name of class being extended, this would now still not work correctly as it would look for a `PHPCS_SecurityAudit\Security\Sniffs\Drupal8\PHPCS_SecurityAudit\Security\Sniffs\Symfony2\Utils` class.

Changing the name of the class being extended to fully qualified, fixes this.

Author: jrfnl

Security/Sniffs/Drupal8/Utils.php

@@ -1,7 +1,7 @@
 <?php
 namespace PHPCS_SecurityAudit\Security\Sniffs\Drupal8;
 
-class Utils extends PHPCS_SecurityAudit\Security\Sniffs\Symfony2\Utils {
+class Utils extends \PHPCS_SecurityAudit\Security\Sniffs\Symfony2\Utils {
 
 	/**
 	* Heavy used function to verify if a token contains user input