bump revision to 0.33.1, create manifest before generating sdist.

bump version to 0.33

bumb version to 0.32.

bump version to 0.31.1

bump to release 0.31.0

Revert usage of setuptools enviroment markers (feature too new)

fix reference to pathlib from pypi

Fix pydoit#161 -- use extras_require to specify per-platform/per-Pyth…

…on dependencies

note on index that python2 support was dropped.

bump version to 0.29.0