Kirill Pavlov

Current CI pipeline is broken. Fix it while replacing unittest with pytest.

Well, otherwise it is hard to contribute to the project. Currently it also fails the build.

There are could be two ways to install the package: 1) with pip 2) build python files and copy them form this repo. Python packaging is already in place: https://pypi.python.org/pypi/tabtools...

http://en.wikipedia.org/wiki/Exponential_smoothing#Double_exponential_smoothing

This is to remove other service dependencies, keep everything on GitHub. Example action: https://github.com/marketplace/actions/sphinx-build