Add build passing badge

README.md

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-# Stitch [ ![Download](https://api.bintray.com/packages/amitkma/maven/stitch-lib/images/download.svg) ](https://bintray.com/amitkma/maven/stitch-lib/_latestVersion)[![Android Arsenal](https://img.shields.io/badge/Android%20Arsenal-Stitch-brightgreen.svg?style=flat)](https://android-arsenal.com/details/1/5802) [![API](https://img.shields.io/badge/API-9%2B-brightgreen.svg?style=flat)](https://android-arsenal.com/api?level=9) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+# Stitch [![Build Status](https://travis-ci.org/amitkma/Stitch.svg?branch=master)](https://travis-ci.org/amitkma/Stitch) [ ![Download](https://api.bintray.com/packages/amitkma/maven/stitch-lib/images/download.svg) ](https://bintray.com/amitkma/maven/stitch-lib/_latestVersion)[![Android Arsenal](https://img.shields.io/badge/Android%20Arsenal-Stitch-brightgreen.svg?style=flat)](https://android-arsenal.com/details/1/5802) [![API](https://img.shields.io/badge/API-9%2B-brightgreen.svg?style=flat)](https://android-arsenal.com/api?level=9) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 Simple threading library using annotations for Android
 
 ## Download