Remove trailing whitespace.

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

library/HTMLPurifier/AttrDef/URI/Email/SimpleCheck.php

@@ -1,12 +1,12 @@
 <?php
 
 /**
- * Primitive email validation class based on the regexp found at 
+ * Primitive email validation class based on the regexp found at
  * http://www.regular-expressions.info/email.html
  */
 class HTMLPurifier_AttrDef_URI_Email_SimpleCheck extends HTMLPurifier_AttrDef_URI_Email
 {
-    
+
     public function validate($string, $config, $context) {
         // no support for named mailboxes i.e. "Bob <bob@example.com>"
         // that needs more percent encoding to be done
@@ -15,6 +15,6 @@ class HTMLPurifier_AttrDef_URI_Email_SimpleCheck extends HTMLPurifier_AttrDef_UR
         $result = preg_match('/^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i', $string);
         return $result ? $string : false;
     }
-    
+
 }