fixed broken link in readme

Update pybind11 version in pyproject.toml

Changed version number

Merge pull request #1 from luigibrancati/wip/improve_code_legibility

Switched value to string in python interface

Modified setter and getter for suit and hand_type

Added string constructor to Hand

Replace from_string with a constructor

Added card from string method

Simplified hand heuristic

Fixed typos

Added to_string methods in place of lambdas

Added operator== and operator>= to Hand

Moved heuristic function inside Hand struct

Added HandType enum