[issue15640] Document importlib.abc.Finder as deprecated

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4bbb1ff4f7ea by Brett Cannon in branch 'default':
Issue #15640: Document importlib.abc.Finder as deprecated.
http://hg.python.org/cpython/rev/4bbb1ff4f7ea

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nosy: +python-dev

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<http://bugs.python.org/issue15640>
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