[issue26798] add BLAKE2 to hashlib

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5c31599de76a by Christian Heimes in branch 'default':
Issue #26798: for loop initial declarations, take 2
https://hg.python.org/cpython/rev/5c31599de76a

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26798>
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