fix ding dong bot for contact class
fix ding dong bot for contact class

Chatie/wechaty,zixia/wechaty,wechaty/wechaty,zixia/wechaty,lijiarui/wechaty,Chatie/wechaty,wechaty/wechaty,wechaty/wechaty,Chatie/wechaty,mukaiu/wechaty,mukaiu/wechaty,binsee/wechaty,binsee/wechaty,binsee/wechaty,mukaiu/wechaty,lijiarui/wechaty