Add myself to the Developers list

Because I've [contributed fixes to the code base][1] I thought maybe I could be
on the attributions list.

[1]: https://github.com/coffeescript-cookbook/coffeescript-cookbook.github.io/search?q=author%3Asukima&type=Commits

authors.md

@@ -35,6 +35,7 @@ The following people are totally rad and awesome because they have contributed r
 * Peter Hellberg *peter@c7.se*
 * Jamie Gaskins *jgaskins@gmail.com*
 * Sami Pussinen *me@samipussinen.com*
+* [Devin Weaver (@sukima)](https://github.com/sukima)
 * ...You! What are you waiting for? Check out the [contributing]({{ site.baseurl }}/contributing) section and get cracking!
 
 # Designers