update README.md

Author: rwieruch

README.md

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 [![Build Status](https://travis-ci.org/the-road-to-learn-react/react-hooks-introduction.svg?branch=master)](https://travis-ci.org/the-road-to-learn-react/react-hooks-introduction) [![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/the-road-to-learn-react/react-hooks-introduction.svg)](https://greenkeeper.io/)
 
-Showcasing popular React Hooks in function components such as useState, useEffect and custom hooks. [Read more about it.](https://www.robinwieruch.de/react-hooks/)
+Showcasing popular React Hooks in function components such as useState, useEffect and custom hooks. Read more about [React Hooks](https://www.robinwieruch.de/react-hooks/) and [data fetching with React Hooks](https://www.robinwieruch.de/react-hooks-fetch-data/).
 
 ## Installation