added emacs to editor suggestions
@@ -450,6 +450,7 @@ Various resources, such as books, websites and articles, for improving your skil
* [jotgit](https://github.com/jdleesmiller/jotgit) - Git-backed real-time collaborative code editing.
* [Lime](http://limetext.org/) - Aims to provide an open source solution to Sublime Text
* [Vim](http://vim.org) - A highly configurable text editor built to enable efficient editing.
+* [GNU Emacs](http://www.gnu.org/software/emacs/) - an extensible, customizable text editor—and more.
## Repositories
*Software package repositories.*
Francisco Augusto