[issue17514] Add the license to argparse.py

[Antoine Pitrou]

Antoine Pitrou added the comment:

> > I'm not sure that's correct, unless only Steven has ever contributed
> > to it. To be correct, you'd have to list all significant contributors.
> 
> Well, then add "and contributors" :)  But we have quite a few files
> with such a header (one person), which would be wrong.

Yeah, it is wrong IMO ;) It also gives a false information about
authorship and therefore who's responsible for the code.

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<http://bugs.python.org/issue17514>
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