promotion add cash and cent

app/models/cent_balance.rb

@@ -16,7 +16,7 @@ class CentBalance < ActiveRecord::Base
                  ["签到第六天", "six_day"],
                  ["签到第七天", "seven_day"],
                  ["购物扣除", "exchange_product"],
-                 ["促销赠送", "promotion"],
+                 ["促销赠送", "promotion_send"],
                ]
   def remain_sum
     b = CentBalance.where("wx_uid = ? and id < ?", self.wx_uid, self.id).last