[issue28720] Add collections.abc.AsyncGenerator

[Roundup Robot]

Roundup Robot added the comment:

New changeset ae1dba7e7d04 by Yury Selivanov in branch '3.6':
Issue #28720: Add collections.abc.AsyncGenerator.
https://hg.python.org/cpython/rev/ae1dba7e7d04

New changeset fb9c8fdef3ec by Yury Selivanov in branch 'default':
Merge 3.6 (issue #28720)
https://hg.python.org/cpython/rev/fb9c8fdef3ec

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nosy: +python-dev

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<http://bugs.python.org/issue28720>
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