Bug fix for RSS2 detection

vendor/PicoFeed/Filter.php

@@ -461,9 +461,19 @@ class Filter
     public static function stripXmlTag($data)
     {
         if (strpos($data, '<?xml ') !== false) {
-            $data = substr($data, strrpos($data, '?>') + 2);
+            $data = ltrim(substr($data, strpos($data, '?>') + 2));
         }
 
+        do {
+
+            $pos = strpos($data, '<?xml-stylesheet ');
+
+            if ($pos !== false) {
+                $data = ltrim(substr($data, strpos($data, '?>') + 2));
+            }
+
+        } while ($pos !== false && $pos < 200);
+
         return $data;
     }