[issue18859] README.valgrind should mention --with-valgrind

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

Thanks! ✨ 🍰 ✨

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.8 -Python 2.7, Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue18859>
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