Remove trailing whitespace.

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

library/HTMLPurifier/AttrDef/Text.php

@@ -5,10 +5,10 @@
  */
 class HTMLPurifier_AttrDef_Text extends HTMLPurifier_AttrDef
 {
-    
+
     public function validate($string, $config, $context) {
         return $this->parseCDATA($string);
     }
-    
+
 }