[Distutils] Closing the Delete File + Re-upload File Loophole.

[Marc Abramowitz]

> You can re-run register as many times as you want which is all you need to adjust the README.

Maybe true but it would be pretty awesome to solve https://bitbucket.org/pypa/pypi/issue/161/rest-formatting-fails-and-there-is-no-way because repeatedly registering and doing trial and error is also not a great experience and it wastes PyPI resources.