Added Credit to Watchful.li

Author: Santiago Garza

README.md

@@ -2,6 +2,8 @@
 
 Wordpress Library for working with the Uptime Robot API
 
+Based off of the [PHP Wrapper Class](https://github.com/watchfulli/uptimeRobot) by [@watchfulli](https://github.com/watchfulli)
+
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