Update URLs

readme.txt

 === WP Revisions Control ===
 Contributors: ethitter
-Donate link: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=10275434
+Donate link: https://ethitter.com/donate/
 Tags: revision, revisions, admin
 Requires at least: 3.6
 Tested up to: 4.2

wp-revisions-control.php

 <?php
 /*
 Plugin Name: WP Revisions Control
-Plugin URI: http://www.ethitter.com/plugins/wp-revisions-control/
+Plugin URI: https://ethitter.com/plugins/wp-revisions-control/
 Description: Control how many revisions are stored for each post type
 Author: Erick Hitter
 Version: 1.2.1