Pytest-cases

[raddessi](https://github.com/raddessi) added a `pyproject.toml` - thanks! Fixed [#65](https://github.com/smarie/python-pytest-cases/issues/65).

See [documentation page](https://smarie.github.io/python-pytest-cases/changelog/) for details.

`pytest_parametrize_plus` was not working correctly with test classes, leading to `fixture 'self' not found`. Fixed [63](https://github.com/smarie/python-pytest-cases/issues/63).

See [documentation page](https://smarie.github.io/python-pytest-cases/changelog/) for details.

Fixed issue happening with `pytest.mark.parametrize` with python 2. Fixed [62](https://github.com/smarie/python-pytest-cases/issues/62).

See [documentation page](https://smarie.github.io/python-pytest-cases/changelog/) for details.

Better error message when users use `THIS_MODULE` in `cases=` instead of `module=`.

Added `__version__` package-level attribute.

See [documentation page](https://smarie.github.io/python-pytest-cases/changelog/) for details.

Now when other plugins try to manipulate the fixture closure, warning messages are emitted but no error is raised. Fixed [55](https://github.com/smarie/python-pytest-cases/issues/55).

Also fixed issue [58](https://github.com/smarie/python-pytest-cases/issues/58) happening with doctest.

See [documentation page](https://smarie.github.io/python-pytest-cases/changelog/) for details.

It was missing from `setup.py`.

See [documentation page](https://smarie.github.io/python-pytest-cases/changelog/) for details.