[issue18983] Specify time unit for timeit CLI

[Roundup Robot]

Roundup Robot added the comment:

New changeset ed34dd00405e by Robert Collins in branch 'default':
Fix patch attribution for issue 18983.
https://hg.python.org/cpython/rev/ed34dd00405e

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18983>
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