Tweak category name

README.md

 	- [Virtual Machines](#virtual-machines)
 	- [Integrated Development Environment](#integrated-development-environment)
 	- [Web Applications](#web-applications)
-	- [PHP Infrastructure](#php-infrastructure)
+	- [Infrastructure](#infrastructure)
 - [Resources](#resources)
 	- [PHP Websites](#php-websites)
 	- [Other Websites](#other-websites)
 * [MailCatcher](https://github.com/sj26/mailcatcher) - A web tool for capturing and viewing emails.
 * [Cachet](https://github.com/cachethq/cachet) - The open source status page system.
 
-## PHP Infrastructure
+## Infrastructure
 *Infrastructure for providing PHP applications and services.*
 
 * [appserver.io](http://appserver.io/) - A multithreaded application server for PHP, written in PHP.