hook_civicrm_contact_get_displayname does not work. Missing an "&" in alterDisplayName inhooks.php

hook.php has a missing & in the function alterDisplayName

Is:
public static function alterDisplayName($displayName, $contactId, $dao) {

Should be:

public static function alterDisplayName(&$displayName, $contactId, $dao) {

As soon as I figure out how to do a PR I will.