Merge pull request #273 from bsinky/ruby-collaborative-text-editor

Add Build Your Own Collaborative Text Editor Using Rails

README.md

@@ -341,6 +341,7 @@
 * [**C++**: _Designing a Simple Text Editor_](http://www.fltk.org/doc-1.1/editor.html)
 * [**Python**: _Python Tutorial: Make Your Own Text Editor_](https://www.youtube.com/watch?v=xqDonHEYPgA) [video]
 * [**Python**: _Create a Simple Python Text Editor!_](http://www.instructables.com/id/Create-a-Simple-Python-Text-Editor/)
+* [**Ruby**: _Build a Collaborative Text Editor Using Rails_](https://blog.aha.io/text-editor/)
 
 #### Build your own `Visual Recognition System`