Include tests in PyPI source tarball

[kwshi]

The source tarball distributed on PyPI does not include the tests:

> curl -fsSL 'https://files.pythonhosted.org/packages/source/c/click-default-group/click-default-group-1.2.2.tar.gz' | tar -tz
click-default-group-1.2.2/
click-default-group-1.2.2/PKG-INFO
click-default-group-1.2.2/README.md
click-default-group-1.2.2/click_default_group.egg-info/
click-default-group-1.2.2/click_default_group.egg-info/PKG-INFO
click-default-group-1.2.2/click_default_group.egg-info/SOURCES.txt
click-default-group-1.2.2/click_default_group.egg-info/dependency_links.txt
click-default-group-1.2.2/click_default_group.egg-info/requires.txt
click-default-group-1.2.2/click_default_group.egg-info/top_level.txt
click-default-group-1.2.2/click_default_group.py
click-default-group-1.2.2/setup.cfg
click-default-group-1.2.2/setup.py

It would be nice if it could do so, since that would enable OS-specific package repository hosts/builders to independently run tests & verify functionality/validity of these packages.

[webknjaz]

Could you verify if v1.2.4 fixed this?