smallcheck-series-0.3: AUTHORS.md

The following people have participated in creating this library, either
by directly contributing code, by providing thoughtful input in
discussions about the library design, or by doing anything else that
helps this library move forwards.

- [Danny Navarro](mailto:j@dannynavarro.net) [@jdnavarro](https://github.com/jdnavarro)
- [Roman Cheplyaka](mailto:roma@ro-che.info) [@feuerbach](https://github.com/feuerbach)