Update OpenGraph.php

OpenGraph now support UTF-8 Encoding.

Author: mamadoo

OpenGraph.php

@@ -60,7 +60,7 @@ static public function fetch($URI) {
         curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
         curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
 
-        $response = curl_exec($curl);
+        $response = mb_convert_encoding(curl_exec($curl), 'HTML-ENTITIES', 'UTF-8');
 
         curl_close($curl);