Use setuptools instead of distutils to upload metadata to PyPI

[hugovk]

I noticed that on PyPI the full description and classifiers aren't shown:

https://pypi.org/project/texttable/

I think this is because the older distutils is being used for upload to PyPI rather than the newer setuptools. See https://stackoverflow.com/a/25372045/724176.

Here's a test upload to Test PyPI using setuptools that shows the full description and all the classifiers:

https://test.pypi.org/project/texttable/

And here's how I usually upload to PyPI (you might not need all of this):

pip install -U pip setuptools wheel twine keyring
python setup.py sdist --format=gztar bdist_wheel
twine upload -r test dist/texttable-1.4.0*

[foutaise]

Thanks for your PR, a new release will follow.