Added Bugzilla

Added Bugzilla in Bug Tracking List

README.md

@@ -465,6 +465,7 @@ CMS are a practical way to setup a website with many features. CMS often come wi
 
   * [92five](http://92fiveapp.com/) - Self hosted project management application ([Source code](https://github.com/chintanbanugaria/92five)) `CC BY-NC 4.0` `PHP`
   * [Apache Bloodhound](https://bloodhound.apache.org/) - Manage software products, Keep track of features, tasks and bugs `Apache` `Python`
+  * [Bugzilla](https://www.bugzilla.org/) - Bug tracking used by the Mozilla projects. `MPLv2` `Pearl`
   * [bulldog](https://github.com/infews/bulldog) - HTML5 task manager, built on todo.txt `MIT` `HTML5` 
   * [Bumpy Booby](http://bumpy-booby.derivoile.fr/) - A simple, responsive and highly customizable PHP bug tracking system. ([Source code](https://github.com/piero-la-lune/Bumpy-Booby)) `MIT` `PHP`
   * [Crepido](https://github.com/arshad/crepido) - Create (kanban) boards to track users and projects from flat markdown files `MIT` `Javascript/Others`