add Snibox demo link

README.md

@@ -1011,7 +1011,7 @@ See https://github.com/n1trux/awesome-sysadmin#monitoring and https://github.com
 - [Phaste](https://pste.pw) - Phalcon-based, MySQL pastebin application with privacy-respecting Piwik integration and syntax highlighting. ([Source Code](https://github.com/FoxDev/Phaste)) `AGPL-3.0` `PHP`
 - [PrivateBin](https://privatebin.info/) - PrivateBin is a minimalist, opensource online pastebin/discussion board where the server has zero knowledge of hosted data. ([Demo](https://privatebin.net/), [Source Code](https://github.com/PrivateBin/PrivateBin)) `Zlib` `PHP`
 - [SharpPaste](https://github.com/phonicmouse/SharpPaste) - Cross-platform C# pastebin with client-side AES-256 encryption that just works. ([Demo](https://sharppaste.nl/)) `MIT` `C#/NancyFX`
-- [Snibox](https://github.com/snibox/snibox) - Code snippets manager with attractive tag-oriented interface. `MIT` `Ruby`
+- [Snibox](https://github.com/snibox/snibox) - Code snippets manager with attractive tag-oriented interface. ([Demo](https://snibox-demo.herokuapp.com/)) `MIT` `Ruby`
 - [snipt](https://snipt.net/) - Long-term memory for coders. Share and store code snippets. ([Source Code](https://github.com/nicksergeant/snipt/)) `BSD` `Python`
 - [Stikked](https://github.com/claudehohl/Stikked) - Advanced and beautiful pastebin. ([Demo](https://paste.scratchbook.ch/)) `GPL-3.0` `PHP`
 - [Sup3rS3cretMes5age](https://github.com/algolia/sup3rS3cretMes5age) - Very simple (to deploy and to use) secret message service using Hashicorp Vault as a secrets storage. `MIT` `Go`