Update CI and CodeCov status in README.md

README.md

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 # SRS(Simple Realtime Server)
 
-![](http://ossrs.net/gif/v1/sls.gif?site=github.com&path=/srs/develop)
-[![](https://circleci.com/gh/ossrs/srs/tree/develop.svg?style=svg&circle-token=1ef1d5b5b0cde6c8c282ed856a18199f9e8f85a9)](https://circleci.com/gh/ossrs/srs/tree/develop)
-[![](https://codecov.io/gh/ossrs/srs/branch/develop/graph/badge.svg)](https://codecov.io/gh/ossrs/srs/branch/develop)
+![](http://ossrs.net/gif/v1/sls.gif?site=github.com&path=/srs/4.0release)
+[![](https://circleci.com/gh/ossrs/srs/tree/4.0release.svg?style=svg&circle-token=1ef1d5b5b0cde6c8c282ed856a18199f9e8f85a9)](https://circleci.com/gh/ossrs/srs/tree/4.0release)
+[![](https://codecov.io/gh/ossrs/srs/branch/4.0release/graph/badge.svg)](https://codecov.io/gh/ossrs/srs/branch/4.0release)
 [![](https://cloud.githubusercontent.com/assets/2777660/22814959/c51cbe72-ef92-11e6-81cc-32b657b285d5.png)](https://github.com/ossrs/srs/wiki/v1_CN_Contact#wechat)
 
 SRS/4.0，[Leo][release4]，是一个流媒体集群，支持RTMP/HLS/WebRTC/SRT/GB28181，高效、稳定、易用，简单而快乐。<br/>