Remove trailing whitespace.

Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>

library/HTMLPurifier/ConfigSchema/Interchange/Namespace.php

@@ -5,15 +5,15 @@
  */
 class HTMLPurifier_ConfigSchema_Interchange_Namespace
 {
-    
+
     /**
      * Name of namespace defined.
      */
     public $namespace;
-    
+
     /**
      * HTML description.
      */
     public $description;
-    
+
 }