Remove trailing whitespace.

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

library/HTMLPurifier/AttrDef/URI/Email.php

@@ -2,14 +2,14 @@
 
 abstract class HTMLPurifier_AttrDef_URI_Email extends HTMLPurifier_AttrDef
 {
-    
+
     /**
      * Unpacks a mailbox into its display-name and address
      */
     function unpack($string) {
         // needs to be implemented
     }
-    
+
 }
 
 // sub-implementations