change api ufo.coupons.send

@@ -457,7 +457,7 @@ class featureModel extends global.yoho.BaseModel {
     */
     couponSendUFO(uid, token) {
         let data = {
-            method: 'app.coupons.send',
+            method: 'ufo.coupons.send',
             uid: uid,
             coupon_tokens: token,
         };