fix iter_chunks type hint (#3230)

[dfroger]

Not sure it's ok to modify working code in order to fix type hints?

[codecov-io]

Codecov Report

Merging #3232 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3232      +/-   ##
==========================================
- Coverage   98.11%   98.07%   -0.04%     
==========================================
  Files          43       43              
  Lines        7853     7857       +4     
  Branches     1354     1354              
==========================================
+ Hits         7705     7706       +1     
- Misses         57       59       +2     
- Partials       91       92       +1

Impacted Files	Coverage Δ
aiohttp/streams.py	99.2% <100%> (ø)	⬆️
aiohttp/tcp_helpers.py	90% <0%> (-6.67%)	⬇️
aiohttp/client_reqrep.py	97.47% <0%> (-0.17%)	⬇️

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[asvetlov]

Thanks

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
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