Remove Travis icon from readme: not available as a private repository
The Contiki Operating System
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-[![Build Status](https://travis-ci.org/contiki-os/contiki.svg?branch=master)](https://travis-ci.org/contiki-os/contiki/branches)
+Travis link: https://travis-ci.com/sics-iot/contiki
Contiki is an open source operating system that runs on tiny low-power
microcontrollers and makes it possible to develop applications that
