Update server requirement

It now requires PHP 5.3 or higher, since the library uses anonymous functions that became available since PHP5.3

If you use an older version, please continue to use the v1 of the library.

Author: pH-7

README.md

@@ -90,7 +90,7 @@ file_put_contents($filename . '_obfuscated.php', '<?php ' . "\r\n" . $sObfusatio
 
 ## Requirement
 
-* PHP 5.2 or higher (works also with PHP 7.2, ..., 7.4, and beyond!)
+* PHP 5.3 or higher (works also with PHP 7.2, ..., 7.4, and beyond!)
 
 
 ## History