better toString for MediaMessage/Message
better toString for MediaMessage/Message

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