Update README.md

Author: Edward Xiao

README.md

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 # react-inputs-validation
 [![npm version](https://badge.fury.io/js/react-inputs-validation.svg)](https://badge.fury.io/js/react-inputs-validation) [![Build Status](https://travis-ci.org/edwardfhsiao/react-inputs-validation.svg?branch=master)](https://travis-ci.org/edwardfhsiao/react-inputs-validation) [![react-inputs-validation](http://img.shields.io/npm/dm/react-inputs-validation.svg)](https://www.npmjs.com/package/react-inputs-validation) [![Package Quality](http://npm.packagequality.com/shield/react-inputs-validation.svg)](http://packagequality.com/#?package=react-inputs-validation) [![Coverage Status](https://coveralls.io/repos/github/edwardfhsiao/react-inputs-validation/badge.svg?branch=master)](https://coveralls.io/github/edwardfhsiao/react-inputs-validation?branch=master) ![npm bundle size (minified + gzip)](https://img.shields.io/bundlephobia/minzip/react-inputs-validation.svg) [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/edwardfhsiao/react-inputs-validation/master/LICENSE)
+[![Join the chat at https://gitter.im/react-inputs-validation/Lobby](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/react-inputs-validation/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 A react inputs validation component.
 # <img src="http://cdn.edwardxiao.zuhe.me/react-inputs.gif" />