Add roc to the list of alternatives (#83)

README.md

@@ -177,6 +177,7 @@ If you don’t agree with the choices made in this project, you might want to ex
 * [budō](https://github.com/mattdesl/budo)
 * [rwb](https://github.com/petehunt/rwb)
 * [sagui](https://github.com/saguijs/sagui)
+* [roc](https://github.com/rocjs/roc)
 
 You can also use module bundlers like [webpack](http://webpack.github.io) and [Browserify](http://browserify.org/) directly.  
 React documentation includes [a walkthrough](https://facebook.github.io/react/docs/package-management.html) on this topic.