Bump decorator from 4.1.2 to 4.2.1
Bump decorator from 4.1.2 to 4.2.1

Bumps [decorator](https://github.com/micheles/decorator) from 4.1.2 to 4.2.1.
- [Release notes](https://github.com/micheles/decorator/releases)
- [Changelog](https://github.com/micheles/decorator/blob/master/CHANGES.md)
- [Commits](https://github.com/micheles/decorator/commits/4.2.1)
moneypark/whydjango,moneypark/whydjango,moneypark/whydjango