Dplib-py

- Handled security audit findings ([23](https://github.com/frictionlessdata/dplib-py/pull/23)).

- Updated to Data Package (v2-final) ([19](https://github.com/frictionlessdata/dplib-py/pull/19)).

- Updated to Data Package (v2-draft) ([13](https://github.com/frictionlessdata/dplib-py/pull/13)).
- Rebased on stricter types for fields ([14](https://github.com/frictionlessdata/dplib-py/pull/14)).

- Initial public release.