Update README.md

README.md

@@ -55,7 +55,7 @@ Installation and documentation
 Contributing
 ------------
 
-[![Build Status](http://jenkins.dockerproject.org/buildStatus/icon?job=Compose%20Master)](http://jenkins.dockerproject.org/job/Compose%20Master/)
+[![Build Status](https://jenkins.dockerproject.org/buildStatus/icon?job=docker/compose/master)](https://jenkins.dockerproject.org/job/docker/job/compose/job/master/)
 
 Want to help build Compose? Check out our [contributing documentation](https://github.com/docker/compose/blob/master/CONTRIBUTING.md).