signature.php echo update

mobile/signature.php

@@ -10,7 +10,7 @@ $data = json_encode($_POST);
 $sign = $_SERVER['HTTP_SIGN'];
 Log::record("signature data : {$data}",Log::DEBUG);
 Log::record("HTTP_SIGN : {$sign}",Log::DEBUG);
-echo ('SUCCESS');
+echo ('success');
 
 //echo("{$echostr}");
 //