Fix link.

README.md

 *Libraries for generating project documentation.*
 
 * [APIGen](https://github.com/apigen/apigen) - Another API documentation generator.
-* [daux.io](https://github.com/justinwalsh/daux.io) - A documentation generator which uses Markdown files.
+* [daux.io](https://github.com/dauxio/daux.io) - A documentation generator which uses Markdown files.
 * [PHP Documentor 2](https://github.com/phpDocumentor/phpDocumentor) - A documentation generator.
 * [phpDox](http://phpdox.de/) - A documentation generator for PHP projects (that is not limited to API documentation).
 * [Sami](https://github.com/FriendsOfPHP/Sami) - An API documentation generator.