Update Joomla webhook

README.md

@@ -71,7 +71,7 @@ Therefore the call back address for your site will be:
 See below for the full address to add to the endpoint (replace NN with your actual ID number):
 
 * For Drupal:  https://example.com/civicrm/payment/ipn/NN
-* For Joomla:  https://example.com/index.php/component/civicrm/?task=civicrm/payment/ipn/NN
+* For Joomla:  https://example.com/?option=com_civicrm&task=civicrm/payment/ipn/NN
 * For Wordpress:  https://example.com/?page=CiviCRM&q=civicrm/payment/ipn/NN
 
 Typically, you only need to configure the end point to send live transactions and you want it to send all events.