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

[Antoine Pitrou]

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


New changeset e224d2865aa0f021b25d68de9a6c2be617341f4c by Antoine Pitrou (Miss Islington (bot)) in branch '3.8':
bpo-37209: Add pickle entry for 3.8 whatsnew (GH-14503) (GH-14512)
https://github.com/python/cpython/commit/e224d2865aa0f021b25d68de9a6c2be617341f4c


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