Dependency not declared

[gatl]

It seems to me that stopit makes use of pkg_resources, that comes with python module setuptools.
In pypi, this dependency on setuptools is not declared meaning that stopit can be installed in a "broken" state and the user then needs to figure out why it does not work. This happened to me and is not an ideal first impression.

I would suggest that this dependency on setuptools be made explicit in Pypi (under requires_dist) to ensure that everything works fine from the start.

Thank you.