Update readme.md (practical-tutorials#351)

Removed a dead link (C project based tutorial)  from additional resources section

Author: arminpatel

README.md

@@ -646,7 +646,6 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
 - [Egghead.io](http://www.egghead.io/)
 - [Michael Herman's Blog](http://mherman.org/)
 - [Thinkster.io](http://thinkster.io)
-- [C Project Based Tutorials](https://github.com/rby90/Project-Based-Tutorials-in-C)
 - [Enlight](https://enlight.nyc/)
 - [Hack Club Workshops](https://hackclub.com/workshops/)
 - [CodeCrafters](https://codecrafters.io/)