+## Changelog
+
+Version | Changes
+--------|--------
+2.2.0 | Added parser constants:<br> http\Url::PARSE_MBUTF8,<br> http\Url::PARSE_MBLOC (on systems with wide character support),<br>http\Url::PARSE_TOPCT,<br>http\Url::PARSE_TOIDN (with libidn support).
+
+## Backwards compatibility
+
+### New parser in v2.2.0
+
+PHP's [parse_url()](http://php.net/parse_url) is avoided since v2.2.0.
+
+Creating an empty url by `new http\Url(NULL, NULL, 0)` will not result in `http://localhost/` anymore but in an empty URL instead.
+