Changelog.md

Current Version ： 0.3 2015.12.18

1. Add websocket support

Version ： 0.2 2015.12.09

1. Use Promise to rewrite Redis.js and Mysql.js. Their interfaces have changed.
2. Add Wechat.js to support wechat sdk.
3. Add update method to reload js file.
4. Add some global method, such as sha1, md5, getRandomStr
5. Use pm2 to manage progress

Version ： 0.1 Initial version.