WARNNING message to wait finishing typescript convert.

README.md

@@ -14,6 +14,14 @@ Wechaty is a Bot Framework for Wechat **Personal** Account that help you easy cr
 [![node](https://img.shields.io/node/v/wechaty.svg?maxAge=2592000)](https://nodejs.org/)
 [![Repo Size](https://reposs.herokuapp.com/?path=wechaty/wechaty)]()
 
+## WARNING
+
+### Wechaty is CONVERTING from Javascript to Typescript now... Please DO NOT clone/pull until this WARNING message gone.
+
+The usable version is: [v0.4.0](https://github.com/wechaty/wechaty/tree/v0.4.0) (2016/10/9) The Latest Javascript Version
+
+Or install via `npm install wechaty`
+
 ## Voice of the Developer
 
 > @GasLin : it may be the best wecaht sdk i have seen in github! [link](https://github.com/wechaty/wechaty/issues/8#issuecomment-228971491)