docs: update README

***NO_CI***

README.md

@@ -14,6 +14,7 @@
 [![Standard - JavaScript Style Guide](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](http://standardjs.com/)  
 [![Chat on Slack](https://img.shields.io/badge/slack-requarks-CC2B5E.svg?style=flat&logo=slack)](https://wiki.requarks.io/slack)
 [![Twitter Follow](https://img.shields.io/badge/follow-%40requarks-blue.svg?style=flat&logo=twitter)](https://twitter.com/requarks)
+[![Reddit](https://img.shields.io/badge/reddit-%2Fr%2Fwikijs-orange?logo=reddit&logoColor=white)](https://www.reddit.com/r/wikijs/)
 [![Subscribe to Newsletter](https://img.shields.io/badge/newsletter-subscribe-yellow.svg?style=flat&logo=mailchimp)](https://blog.js.wiki/subscribe)
 
 ##### A modern, lightweight and powerful wiki app built on NodeJS