[issue20378] Implement `Signature.__repr__`

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3f9a81297b39 by Yury Selivanov in branch 'default':
inspect.signature: Improve repr of Signature and Parameter. Closes #20378
http://hg.python.org/cpython/rev/3f9a81297b39

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nosy: +python-dev
resolution:  -> fixed
stage: test needed -> committed/rejected
status: open -> closed

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<http://bugs.python.org/issue20378>
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