[docs] [issue37209] Add what's new entries for pickle enhancements

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:


New changeset ec6c1bd0491590f3c0e2908a7b2dfb91b6acdae9 by Antoine Pitrou (Pierre Glaser) in branch 'master':
bpo-37209: Add pickle entry for 3.8 whatsnew (GH-14503)
https://github.com/python/cpython/commit/ec6c1bd0491590f3c0e2908a7b2dfb91b6acdae9


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<https://bugs.python.org/issue37209>
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