Update README.md

Author: ziad-saab

README.md

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 # [React](http://facebook.github.io/react/)-checkbox-group
 
 [![Greenkeeper badge](https://badges.greenkeeper.io/ziad-saab/react-checkbox-group.svg)](https://greenkeeper.io/)
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 [![Build Status](https://travis-ci.org/ziad-saab/react-checkbox-group.svg?branch=master)](https://travis-ci.org/ziad-saab/react-checkbox-group)
 
 This is your average checkbox group: