more entropy in reg ids

gistfile1.txt

//Build the registration id
function espresso_build_registration_id_custom($event_id){
  remove_filter('filter_hook_espresso_registration_id', 'espresso_build_registration_id', 10, 1);
	return uniqid($event_id . '-', true);
}
		
//Registration id filter
add_filter('filter_hook_espresso_registration_id', 'espresso_build_registration_id_custom', 8, 1);