Travis build status.

readme.md

@@ -18,3 +18,9 @@ Mosquitto project information is available at the following locations:
 There is also a public test server available at <http://test.mosquitto.org/>
 
 Mosquitto was written by Roger Light <roger@atchoo.org>
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+https://travis-ci.org/eclipse/mosquitto.svg?branch=master
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