README.rst: Update Static URL (point to PyPI)

  $ wget -S http://lukearno.com/projects/static/
  ...
  HTTP request sent, awaiting response...
    HTTP/1.1 404 Not Found
    ...
  2013-09-20 07:53:36 ERROR 404: Not Found.

PyPI still points to lukearno.com as the home page, but we can expect
the PyPI URL to age better.

README.rst

@@ -6,7 +6,7 @@ serve static assets from production with a WSGI server like Gunicorn.
 
 Django `doesn't recommend <https://docs.djangoproject.com/en/1.5/howto/static-files/#admonition-serving-the-files>`_
 the production use of its static file server for a number of reasons.
-There exists, however, a lovely WSGI application aptly named `Static <http://lukearno.com/projects/static/>`_.
+There exists, however, a lovely WSGI application aptly named `Static <https://pypi.python.org/pypi/static>`_.
 
 .. image:: http://farm8.staticflickr.com/7387/8907351990_58677d7c35_z.jpg