codestyle - remove trailing whitespaces

Behavioral/Observer/User.php

@@ -4,7 +4,7 @@ namespace DesignPatterns\Behavioral\Observer;
 
 /**
  * Observer pattern : The observed object (the subject)
- * 
+ *
  * The subject maintains a list of Observers and sends notifications.
  *
  */

Behavioral/Observer/UserObserver.php

@@ -10,7 +10,7 @@ class UserObserver implements \SplObserver
     /**
      * This is the only method to implement as an observer.
      * It is called by the Subject (usually by SplSubject::notify() )
-     * 
+     *
      * @param \SplSubject $subject
      */
     public function update(\SplSubject $subject)