[issue18974] Use argparse in the diff script

[Roundup Robot]

Roundup Robot added the comment:

New changeset 08b3ee523577 by Serhiy Storchaka in branch 'default':
Issue #18974: Tools/scripts/diff.py now uses argparse instead of optparse.
http://hg.python.org/cpython/rev/08b3ee523577

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nosy: +python-dev

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<http://bugs.python.org/issue18974>
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