README: Update semaphore link

README.md

@@ -2,7 +2,7 @@
 
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/ArduPilot/ardupilot?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
-[![Build SemaphoreCI](https://semaphoreci.com/api/v1/projects/4d28a40d-b6a6-4bfb-9780-95d92aabb178/667563/badge.svg)](https://semaphoreci.com/diydrones/ardupilot)
+[![Build SemaphoreCI](https://semaphoreci.com/api/v1/ardupilot/ardupilot/branches/master/badge.svg)](https://semaphoreci.com/ardupilot/ardupilot)
 
 [![Build Travis](https://travis-ci.org/ArduPilot/ardupilot.svg?branch=master)](https://travis-ci.org/ArduPilot/ardupilot)