Deprecate debug argument

[asvetlov]

No description provided.

[codecov-io]

Codecov Report

Merging #3381 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3381      +/-   ##
==========================================
- Coverage   97.99%   97.96%   -0.04%     
==========================================
  Files          44       44              
  Lines        8486     8489       +3     
  Branches     1375     1376       +1     
==========================================
  Hits         8316     8316              
- Misses         72       74       +2     
- Partials       98       99       +1

Impacted Files	Coverage Δ
aiohttp/web_app.py	96.15% <100%> (+0.04%)	⬆️
aiohttp/tcp_helpers.py	90% <0%> (-6.67%)	⬇️
aiohttp/client_reqrep.py	97.28% <0%> (-0.16%)	⬇️

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