[issue32169] Drop python 3.4-3.5 code from asyncio.unix_events

[Andrew Svetlov]

Change by Andrew Svetlov <andrew.svetlov at gmail.com>:


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keywords: +patch
pull_requests: +4549
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32169>
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