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add whatsnew that was missed from 31d6de5aba009914efa8f0f3c3d7da35217578eb (#18344)

C
Chris Withers committed
b6999e5690c7006b0ba4049cfd638513c982a90c
Parent: 5807efd
Committed by GitHub <noreply@github.com> on 2/4/2020, 8:05:25 AM