[issue30406] async and await should be keywords in 3.7

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> (...) don't raise any deprecation warning in 3.6.

python3 requires -Wd to display DeprecationWarning:

https://mail.python.org/pipermail/python-dev/2017-November/150149.html

Yury Selivanov: "We had PendingDeprecationWarning for async/await names in 3.5, and DeprecationWarning in 3.6."

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<https://bugs.python.org/issue30406>
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