[issue26798] add BLAKE2 to hashlib

[Roundup Robot]

Roundup Robot added the comment:

New changeset 46b34706eb41 by Christian Heimes in branch 'default':
Issue 26798: fetch OSError and HTTPException like other tests that use open_urlresource.
https://hg.python.org/cpython/rev/46b34706eb41

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