Update README.md

Fixed link of the build badge

Author: AurelioDeRosa

README.md

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 # Github.js
 
-[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/michael/github?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)[![Stories in Ready](https://badge.waffle.io/michael/github.png?label=ready&title=Ready)](https://waffle.io/michael/github)[![Build Status](https://travis-ci.org/darvin/github.svg?branch=master)](https://travis-ci.org/darvin/github)[![codecov.io](https://codecov.io/github/michael/github/coverage.svg?branch=master)](https://codecov.io/github/michael/github?branch=master)
+[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/michael/github?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) [![Stories in Ready](https://badge.waffle.io/michael/github.png?label=ready&title=Ready)](https://waffle.io/michael/github) [![Build Status](https://travis-ci.org/michael/github.svg?branch=master)](https://travis-ci.org/michael/github) [![codecov.io](https://codecov.io/github/michael/github/coverage.svg?branch=master)](https://codecov.io/github/michael/github?branch=master)
 
 Github.js provides a minimal higher-level wrapper around git's [plumbing commands](http://git-scm.com/book/en/Git-Internals-Plumbing-and-Porcelain), exposing an API for manipulating GitHub repositories on the file level. It was formerly developed in the context of [Prose](http://prose.io), a content editor for GitHub.