Update README.md

Author: amacneil

README.md

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 # Omnipay Common
 
 Core components for the Omnipay payment processing library
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+[![Build Status](https://travis-ci.org/omnipay/common.png?branch=master)](https://travis-ci.org/omnipay/common)
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+[![Total Downloads](https://poser.pugx.org/omnipay/common/d/total.png)](https://packagist.org/packages/omnipay/common)