Updated code coverage badge URL

Author: jaredbiehler

README.md

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 A PHP-based server-side proxy for interacting with the [NPR One API](http://dev.npr.org/api/)'s authorization server. Use this proxy to secure your OAuth2 credentials.
 
-[![Packagist](https://img.shields.io/packagist/v/npr/npr-one-backend-proxy.svg?maxAge=2592000)](https://packagist.org/packages/npr/npr-one-backend-proxy) [![Packagist](https://img.shields.io/packagist/l/npr/npr-one-backend-proxy.svg?maxAge=2592000)](https://github.com/nprdm/npr-one-backend-proxy-php/blob/master/LICENSE.md) [![Packagist](https://img.shields.io/packagist/dt/npr/npr-one-backend-proxy.svg?maxAge=2592000)](https://packagist.org/packages/npr/npr-one-backend-proxy) [![Build Status](https://travis-ci.org/nprdm/npr-one-backend-proxy-php.svg?branch=master)](https://travis-ci.org/nprdm/npr-one-backend-proxy-php) [![Coverage Status](https://coveralls.io/repos/nprdm/npr-one-backend-proxy-php/badge.svg?branch=master&service=github)](https://coveralls.io/github/nprdm/npr-one-backend-proxy-php?branch=master)
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+[![Packagist](https://img.shields.io/packagist/v/npr/npr-one-backend-proxy.svg?maxAge=2592000)](https://packagist.org/packages/npr/npr-one-backend-proxy) [![Packagist](https://img.shields.io/packagist/l/npr/npr-one-backend-proxy.svg?maxAge=2592000)](https://github.com/nprdm/npr-one-backend-proxy-php/blob/master/LICENSE.md) [![Packagist](https://img.shields.io/packagist/dt/npr/npr-one-backend-proxy.svg?maxAge=2592000)](https://packagist.org/packages/npr/npr-one-backend-proxy) [![Build Status](https://travis-ci.org/nprdm/npr-one-backend-proxy-php.svg?branch=master)](https://travis-ci.org/nprdm/npr-one-backend-proxy-php) [![Coverage Status](https://coveralls.io/repos/github/nprdm/npr-one-backend-proxy-php/badge.svg?branch=master)](https://coveralls.io/github/nprdm/npr-one-backend-proxy-php?branch=master)
 
 ##### Table of Contents