Add py.typed marker

Remove deprecated toml dependency in favor of native tomllib (or tomli on older Python versions).

Relax setuptools version number

This release drops support for Python 2 and updates the project to reflect modern Python standards: pytest, pyproject.toml, type hinting, ...

Add support for GeoJSON coordinate ordering (lon, lat).

Added support for cleaner interface: polyline.encode/decode()

Fixed issue with rounding

Added support for encoding/decoding with a different precision than 5.