HabitRPG is now called Habitica, URLs have changed

Changes the name and URL of HabitRPG to Habitica (habitica.com), and updates the GitHub link.

README.md

@@ -451,7 +451,7 @@ CMS are a practical way to setup a website with many features. CMS often come wi
   * [Crepido](https://github.com/arshad/crepido) - Create (kanban) boards to track users and projects from flat markdown files `MIT` `Javascript/Others`
   * [Flyspray](http://www.flyspray.org/) - uncomplicated, web-based bug tracking system ([Source code](https://github.com/Flyspray/flyspray)) `GPLv2`
   * [Gaskit](https://github.com/bkeepers/gaskit) - a git-backed issue tracker. It uses a branch in your local git database to store the tickets. `GPL`
-  * [HabitRPG](http://habitrpg.com/) - A habit tracker app which treats your goals like a Role Playing Game. ([Source code](https://github.com/lefnire/habitrpg))
+  * [Habitica](http://habitica.com/) - A habit tracker app which treats your goals like a Role Playing Game. Previously called HabitRPG. ([Source code](https://github.com/HabitRPG/habitrpg))
   * [JIRA](https://www.atlassian.com/software/jira) `⊘ Proprietary` - A professional and extensible issue tracker `Java`
   * [Kanboard](http://kanboard.net/) - A simple and open source visual task board `AGPLv3`
   * [MantisBT](https://www.mantisbt.org/) - Self hosted bug tracker, fits best for software development - ([Demo](https://www.mantisbt.org/bugs/my_view_page.php)) -  ([Source code](https://github.com/mantisbt/mantisbt)) - `GPLv2`