README: add CI build status for master branch

README.md

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 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/diydrones/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)
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+[![Build Travis](https://travis-ci.org/diydrones/ardupilot.svg?branch=master)](https://travis-ci.org/diydrones/ardupilot)
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 ### The ArduPilot project is made up of: ###
 >>ArduCopter (or APM:Copter) : [code](https://github.com/diydrones/ardupilot/tree/master/ArduCopter), [wiki](http://copter.ardupilot.com)