[issue38692] add a pidfd child process watcher

[Kyle Stanley]

Kyle Stanley <aeros167 at gmail.com> added the comment:

> PidfdChildWatcher should be enumerated in unix_events.py:__all__ to make the class visible by asyncio import rules.

> Kyle, would you make a post-fix PR?

I actually just noticed that myself and was coming back to the bpo issue to mention that it was missing from __all__. I'll take of that, no problem.

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<https://bugs.python.org/issue38692>
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