Update README.md

Fixed a link

Author: Raiou

README.md

@@ -35,7 +35,7 @@ sudo systemctl reload httpd
 
 All set! UpCloud can now be found as an infrastructure provider on your WHMCS admin panel. But before you can begin setting up cloud plans, you'll need to configure API access to your UpCloud account if you haven't already done so.
 
-Follow the instructions at our [API tutorial](https://upcloud.com/community/tutorials/getting-started-upcloud-api/) to configure new API credentials for WHMCS.
+Follow the instructions at our [API tutorial](https://upcloud.com/community/tutorials/get-started-upcloud-whmcs-module/) to configure new API credentials for WHMCS.
 
 ## Usage