[issue27876] Add SSLContext.set_version_range(minver, maxver=None)

[Giampaolo Rodola']

Changes by Giampaolo Rodola' <g.rodola at gmail.com>:


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nosy:  -giampaolo.rodola

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27876>
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