add WBR to the list of self closing tags

simple_html_dom.php

@@ -997,7 +997,7 @@ class simple_html_dom
     public $default_span_text = "";
 
     // use isset instead of in_array, performance boost about 30%...
-    protected $self_closing_tags = array('img'=>1, 'br'=>1, 'input'=>1, 'meta'=>1, 'link'=>1, 'hr'=>1, 'base'=>1, 'embed'=>1, 'spacer'=>1);
+    protected $self_closing_tags = array('img'=>1, 'br'=>1, 'wbr'=>1, 'input'=>1, 'meta'=>1, 'link'=>1, 'hr'=>1, 'base'=>1, 'embed'=>1, 'spacer'=>1);
     protected $block_tags = array('root'=>1, 'body'=>1, 'form'=>1, 'div'=>1, 'span'=>1, 'table'=>1);
     // Known sourceforge issue #2977341
     // B tags that are not closed cause us to return everything to the end of the document.