Deprecate .loop property

[asvetlov]

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[codecov-io]

Codecov Report

Merging #3374 into master will decrease coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3374      +/-   ##
==========================================
- Coverage   97.96%   97.93%   -0.03%     
==========================================
  Files          44       44              
  Lines        8483     8486       +3     
  Branches     1375     1375              
==========================================
+ Hits         8310     8311       +1     
- Misses         74       76       +2     
  Partials       99       99

Impacted Files	Coverage Δ
aiohttp/web_fileresponse.py	97.51% <ø> (ø)	⬆️
aiohttp/web_request.py	98.72% <0%> (-0.51%)	⬇️
aiohttp/web_app.py	96.11% <100%> (+0.01%)	⬆️
aiohttp/connector.py	97.59% <100%> (ø)	⬆️

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