change readme doc (#805)
change readme doc (#805)

* change readme doc

* change doc/index.md to chatie.io

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