doc(README): add coverage information

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dermesser · May 25, 2016 · e0661f7 · e0661f7
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 [![Build Status](https://travis-ci.org/Byron/yup-oauth2.svg)](https://travis-ci.org/Byron/yup-oauth2)
+[![Coverage Status](https://coveralls.io/repos/github/Byron/yup-oauth2/badge.svg?branch=master)](https://coveralls.io/github/Byron/yup-oauth2?branch=master)
 
 **yup-oauth2** is a utility library which will implement [oauthv2 device authentication](https://developers.google.com/youtube/v3/guides/authentication#devices) suitable for [**yup**](https://github.com/Byron/yup) to work.