Update py-setuptools to 20.1.1.

20.1.1
------

* Update ``upload_docs`` command to also honor keyring
  for password resolution.

20.1
----

* Added support for using passwords from keyring in the upload
command. See `the upload docs
<http://pythonhosted.org/setuptools/setuptools.html#upload-upload-source-and-or-egg-distributions-to-pypi>`_
for details.

20.0
----

* Issue #118: Once again omit the package metadata (egg-info)
  from the list of outputs in ``--record``. This version of setuptools
  can no longer be used to upgrade pip earlier than 6.0.

(wiz)