[issue27959] Add 'oem' encoding

[Roundup Robot]

Roundup Robot added the comment:

New changeset 786c34bdc27a by Steve Dower in branch 'default':
Issue #27959: Updates NEWS and whatsnew
https://hg.python.org/cpython/rev/786c34bdc27a

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<http://bugs.python.org/issue27959>
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