* Make sure type checking fails decorating non abstract class by flaeppe in https://github.com/antonagestam/abcattrs/pull/25
* Fix premature check on abstract class by flaeppe in https://github.com/antonagestam/abcattrs/pull/23
**Full Changelog**: https://github.com/antonagestam/abcattrs/compare/0.3.2...0.4.0