Add Helix (#85)

https://helix-editor.com/

README.md

@@ -65,6 +65,7 @@ List of projects that provide terminal user interfaces
 ## <a name="editors"></a>Editors
 
 - [amp](https://github.com/jmacdonald/amp) A complete text editor for your terminal
+- [helix](https://helix-editor.com/) A post-modern text editor.
 - [kakoune](http://kakoune.org/) A modern, modal text editor with focus on interactivity and efficiency
 - [micro](https://github.com/zyedidia/micro) A modern and intuitive terminal-based text editor
 - [o](https://github.com/xyproto/o) Text editor limited by VT100, suitable for programming, writing git commit messages and editing Markdown