[docs] [issue33071] Document that PyPI no longer requires 'register'

[Christian Heimes]

Change by Christian Heimes <lists at cheimes.de>:


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components:  -Distutils
keywords: +easy
versions: +Python 2.7, Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33071>
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