Merge pull request #4017 from totoprayogo1916/userguide

remove extra comma in readme

Author: paulbalandan

admin/userguide/README.md

@@ -2,7 +2,7 @@
 
 ## What is CodeIgniter?
 
-CodeIgniter is a PHP full-stack web framework that is light, fast, flexible, and secure. 
+CodeIgniter is a PHP full-stack web framework that is light, fast, flexible and secure. 
 More information can be found at the [official site](http://codeigniter.com).
 
 This repository holds a composer-installable pre-built user guide for the framework.