[issue27283] Add a "What's New" entry for PEP 519

[Berker Peksag]

Berker Peksag added the comment:

pep_519_whatsnew.diff looks pretty good to me, thanks! It would be nice to add a simple example to demonstrate the feature (like we did for PEP 498: https://docs.python.org/3.6/whatsnew/3.6.html#pep-498-formatted-string-literals)

>>> import pathlib
>>> with open(pathlib.Path('README')) as f:
...   readme = f.read()
...

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nosy: +berker.peksag
stage: patch review -> commit review
type:  -> enhancement

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27283>
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