Fix parse_url error with object being returned by url() method.

Fixes #6

Thanks to @iboved for suggestion.

classes/Normalise.php

@@ -219,7 +219,7 @@ protected function isExternal(string $url)
     protected function getHostname()
     {
         return $_SERVER['SERVER_NAME']
-            ?? parse_url(url(), PHP_URL_HOST)
+            ?? parse_url(url()->current(), PHP_URL_HOST)
             ?? null;
     }
 }