Auto backport of pr 28074 on 0.25.x#28078

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TomAugspurger merged 2 commits intopandas-dev:0.25.xfrom

TomAugspurger:auto-backport-of-pr-28074-on-0.25.x

Aug 22, 2019

Commits on Aug 21, 2019

Backport PR #28073: DOC: Update whatsnew
TomAugspurger
committed
BUG: iter with readonly values, closes #28055 (#28074)

jbrockmendel
authored and
TomAugspurger
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