Add Melody to Composer

README.md

 * [Composer](http://getcomposer.org/)/[Packagist](http://packagist.org/) - A package and dependency manager.
 * [Composer Installers](https://github.com/composer/installers) - A  multi framework Composer library installer.
 * [Pickle](https://github.com/FriendsOfPHP/pickle) - A PHP extension installer.
+* [Melody](http://melody.sensiolabs.org/) - A tool to build one file Composer scripts.
 
 ## Dependency Management Extras
 *Extras related to dependency management.*