- update to 17.1:
* Issue #380: Add support for range operators on environment
marker evaluation.
* Issue #378: Do not use internal importlib._bootstrap module.
* Issue #390: Disallow console scripts with path separators in
the name. Removes unintended functionality and brings behavior
into parity with pip.
* Pull Request #130: Better error messages for errors in
parsed requirements.
* Pull Request #133: Removed ``setuptools.tests`` from the
installed packages.
* Issue #373: Provisionally expose
``pkg_resources._initialize_master_working_set``, allowing for
imperative re-initialization of the master working set.