af_readability: force utf8 preamble on html document load. no idea why but it...

af_readability: force utf8 preamble on html document load. no idea why but it seems to work better even for not-unicode sites.

plugins/af_readability/init.php

@@ -162,7 +162,7 @@ class Af_Readability extends Plugin {
 		if ($tmp && mb_strlen($tmp) < 1024 * 500) {
 			$tmpdoc = new DOMDocument("1.0", "UTF-8");
 
-			if (!$tmpdoc->loadHTML($tmp))
+			if (!$tmpdoc->loadHTML('<?xml encoding="utf-8" ?>\n' . $tmp))
 				return false;
 
 			if (strtolower($tmpdoc->encoding) != 'utf-8') {