Update README.md

Author: JessYanCoding

README.md

@@ -1,6 +1,6 @@
 # RxErrorHandler
 [ ![Bintray](https://img.shields.io/badge/bintray-v2.1.0-brightgreen.svg) ](https://bintray.com/jessyancoding/maven/rxerrorhandler/2.1.0/link)
-[ ![Build Status](https://travis-ci.org/JessYanCoding/RxErrorHandler.svg?branch=master) ](https://travis-ci.org/JessYanCoding/RxErrorHandler)
+[ ![Build Status](https://travis-ci.org/JessYanCoding/RxErrorHandler.svg?branch=2.x) ](https://travis-ci.org/JessYanCoding/RxErrorHandler)
 [ ![API](https://img.shields.io/badge/API-15%2B-blue.svg?style=flat-square) ](https://developer.android.com/about/versions/android-4.0.3.html)
 [ ![License](http://img.shields.io/badge/License-Apache%202.0-blue.svg?style=flat-square) ](http://www.apache.org/licenses/LICENSE-2.0)