Update README.md

Author: rwieruch

README.md

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+**DEPRECATED: Please use this [starter project](https://github.com/rwieruch/nextjs-firebase-authentication) instead.**
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+______
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 # nextjs-redux-firebase-authentication
 
 [![Build Status](https://travis-ci.org/taming-the-state-in-react/nextjs-redux-firebase-authentication.svg?branch=master)](https://travis-ci.org/taming-the-state-in-react/nextjs-redux-firebase-authentication) [![Slack](https://slack-the-road-to-learn-react.wieruch.com/badge.svg)](https://slack-the-road-to-learn-react.wieruch.com/) [![Greenkeeper badge](https://badges.greenkeeper.io/taming-the-state-in-react/nextjs-redux-firebase-authentication.svg)](https://greenkeeper.io/)