setup.py: remove 'publish' alias for `setup.py upload`; use twine instead
setup.py: remove 'publish' alias for `setup.py upload`; use twine instead

setuptools `upload` command is not recommeded by the PyPA packaging guide,
becaue of security issues:
https://packaging.python.org/distributing/#upload-your-distributions

You should use `twine upload dist/*` instead.

greginvm/pyclipper,anthrotype/pyclipper,greginvm/pyclipper,greginvm/pyclipper,anthrotype/pyclipper,anthrotype/pyclipper