[docs] [issue20749] shutil.unpack_archive(): security concerns not documented

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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stage:  -> needs patch
type:  -> behavior
versions: +Python 2.7, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20749>
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