📝 small doc fix

Author: ivank

README.md

@@ -27,15 +27,13 @@ $mailer->registerPLugin(new ObserversPlugin([
     ]
 ]));
 
-
 $headers = $message->getHeaders();
 $headers->addTextHeader(ObserversPlugin::HEADER, 'event1');
 
 // Will add '[email protected]' to bcc
 $mailer->send($message);
 ```
 
-
 License
 -------