Python-redsys

Added

- Use mypy to type codebase
- Request and Response tests
- Use staticmethod where necessary

Changed

- Requests are now initialized with a dictionary of parameters(example on README)
- The code and message of a Response can now be accessed from `response.code` and `response.message`
- is_paid, is_refunded, is_canceled and is_authorized are now properties instead of methods

Fixed

- Correctly enforce abstract class

Added

- Client tests

Changed

- Replaced pycrypto(which is abandoned) by PyCryptodome
- Migrated all the constants to a single file(currencies, languages and transactions)
- Drop compatibility with Python 2.x
- Code cleanup

- Initial release