Update README.md

Author: Alex/AT

README.md

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 PHP bindings for 0MQ. The documentation is available at http://php.net/zmq
 
-[![Build Status](https://travis-ci.org/mkoppanen/php-zmq.png?branch=master)](https://travis-ci.org/mkoppanen/php-zmq)
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 The API is roughly as follows:
 
     <?php