2.4.4 - 2017/09/17

- ArrayFlags and ItemFlags are merged with PropFlags
- API adjustments

2.4.3 - 2017/06/20

-TzSign is public

2.4.2 - 2017/06/20

-XmpDateTime: the c struct is public.

2.4.1 - 2017/06/04

-XmpIterator::new() declaration was wrong. Also xmp_iterator_new()
-Export NS_* from the -sys crate.

2.4.0 - 2017/01/07

-Added WEBP type.

2.3.0 - 2016/03/22

-Initial release.
