[issue28635] Update What's New for 3.6

[Roundup Robot]

Roundup Robot added the comment:

New changeset d12bc674b74e by Yury Selivanov in branch '3.6':
Issue #28635: Drop the note that whatsnew is incomplete
https://hg.python.org/cpython/rev/d12bc674b74e

New changeset 1883072efc5f by Yury Selivanov in branch 'default':
Merge 3.6 (issue #28635)
https://hg.python.org/cpython/rev/1883072efc5f

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