Updated readme

Author: lazychaser

README.markdown

@@ -4,13 +4,16 @@
 [![Latest Unstable Version](https://poser.pugx.org/kalnoy/nestedset/v/unstable.svg)](https://packagist.org/packages/kalnoy/nestedset)
 [![License](https://poser.pugx.org/kalnoy/nestedset/license.svg)](https://packagist.org/packages/kalnoy/nestedset)
 
-This is a Laravel 4-5 package for working with trees in a database.
+This is a Laravel 4-5 package for working with trees in relational databases.
 
 *   **Laravel 5.2** is supported since v4
 *   **Laravel 5.1** is supported in v3
 *   **Laravel 4** is supported in v2
 
-__[Donate](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=5TJUM7FYU5VR2)__
+Although this project is completely free for use, I appreciate any support!
+
+-   __[Donate via PayPal](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=5TJUM7FYU5VR2)__
+-   My Visa: 4276 0700 1073 4244
 
 __Contents:__