[issue27814] contextlib.suppress: Add whitelist argument

[Michael Büsch]

Michael Büsch added the comment:

Thanks for your comments.
Here's version 2 of the patch.

Changes:
- A typo in the docstring was fixed.
- Space was removed in keyword assignments.
- Documentation was added.

(Note that I signed and sent the contributor agreement. It should arrive soon.)

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Added file: http://bugs.python.org/file44170/contextlib-suppress-whitelist-v2.patch

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