Support building wheels automatically using github actions

[yoav-orca]

Fixed #13 and also fixes another issue I encountered trying to use Poetry to install this package using git https://github.com/python-poetry/poetry/issues/3286

I hope this could be the basis for publishing a new package on PyPI

[andreasvc]

Thanks.

Actually Cython doesn't have to be a requirement because the package on pypi can include the generated c/cpp files: https://cython.readthedocs.io/en/latest/src/userguide/source_files_and_compilation.html#distributing-cython-modules

[yoava333]

It's a build dependency, it's only a dependency when building the package

[andreasvc]

Ahh I see. I registered the pyre2 package: https://pypi.org/project/pyre2/