Collections import

[BeatButton]

In Python 3.8, importing abstract base classes from collections instead of collections.abc will stop working.

This is a pretty minor change, so I don't know that more explanation is necessary, or whether I should actually be added to the list of contributors, but shrug.

[webknjaz]

Thanks!

[codecov-io]

Codecov Report

Merging #3258 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3258      +/-   ##
==========================================
- Coverage   98.03%   97.99%   -0.04%     
==========================================
  Files          43       43              
  Lines        7885     7886       +1     
  Branches     1354     1354              
==========================================
- Hits         7730     7728       -2     
- Misses         63       65       +2     
- Partials       92       93       +1

Impacted Files	Coverage Δ
aiohttp/multipart.py	96.02% <100%> (ø)	⬆️
aiohttp/tcp_helpers.py	90% <0%> (-6.67%)	⬇️
aiohttp/client_reqrep.py	97.47% <0%> (-0.17%)	⬇️

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If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new