Update README.md

Author: mayankchd

README.md

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 # mern-cli
 [![Build Status](https://travis-ci.org/Hashnode/mern-cli.svg?branch=master)](https://travis-ci.org/Hashnode/mern-cli)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com)
 
 A CLI for getting started with MERN stack. It offers a [super simple boilerplate project](https://github.com/Hashnode/mern-starter) and additional utilities to get started with isomorphic React and Redux apps.