#545 trim comma from encoding value

Author: Valentin Popov

src/Document.php

@@ -30,7 +30,7 @@ public function __construct(Extractor $extractor)
         $contentType = $extractor->getResponse()->getHeaderLine('content-type');
         preg_match('/charset="?(.*?)(?=$|\s|;|")/i', $contentType, $match);
         if (!empty($match[1])) {
-            $encoding = $match[1];
+            $encoding = trim($match[1], ',');
         } elseif (!empty($html)) {
             preg_match('/charset="?(.*?)(?=$|\s|;|")/i', $html, $match);
             if (!empty($match[1])) {