Update readme.md with pt_PT and ro languages

Added european portughese and romanian languages to readme description

Author: micovi

README.md

@@ -12,7 +12,7 @@ PR is welcome!
 
  * The project was forked from [tsawler/laravel-filemanager](http://packalyst.com/packages/package/tsawler/laravel-filemanager)
  * Customizable routes and middlewares
- * Supported locales : ar, bg, en, es, fa, fr, he, hu, nl, pt-BR, ru, tr, zh-CN, zh-TW
+ * Supported locales : ar, bg, en, es, fa, fr, he, hu, nl, pt-BR, pt_PT, ro, ru, tr, zh-CN, zh-TW
  * Supports public and private folders for multi users
  * Supports multi-level folders
  * Supports using independently(see integration doc)