[tests] Ignore code coverage for Predis\Autoloader.

src/Autoloader.php

@@ -16,6 +16,7 @@ namespace Predis;
  *
  * @author Eric Naeseth <eric@thumbtack.com>
  * @author Daniele Alessandri <suppakilla@gmail.com>
+ * @codeCoverageIgnore
  */
 class Autoloader
 {