Updated readme

Author: Leon

README.md

@@ -99,6 +99,18 @@ class VpsServerOrdered extends Notification
 }
 ```
 
+Additionally you can add recipients (single value or array)
+
+``` php
+    return (new MessagebirdMessage("Your {$notifiable->service} was ordered!"))->setRecipients($recipients);
+```
+
+In order to handle a status report you can also set a reference
+
+``` php
+    return (new MessagebirdMessage("Your {$notifiable->service} was ordered!"))->setReference($id);
+```
+
 ## Changelog
 
 Please see [CHANGELOG](CHANGELOG.md) for more information what has changed recently.