Add travis repo badge to readme (#1561)
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# [Prism](http://prismjs.com/)
+[![Build Status](https://travis-ci.org/PrismJS/prism.svg?branch=master)](https://travis-ci.org/PrismJS/prism)
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Prism is a lightweight, robust, elegant syntax highlighting library. It's a spin-off project from [Dabblet](http://dabblet.com/).
You can learn more on http://prismjs.com/.