Fix #2024: provide BaseRequest.loop attribute

[asvetlov]

Fix for #2024

[codecov-io]

Codecov Report

Merging #2132 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2132      +/-   ##
==========================================
+ Coverage   97.07%   97.08%   +<.01%     
==========================================
  Files          38       38              
  Lines        7723     7741      +18     
  Branches     1346     1349       +3     
==========================================
+ Hits         7497     7515      +18     
  Misses        102      102              
  Partials      124      124

Impacted Files	Coverage Δ
aiohttp/web_protocol.py	87.8% <ø> (ø)	⬆️
aiohttp/web.py	99.65% <ø> (ø)	⬆️
aiohttp/web_server.py	100% <ø> (ø)	⬆️
aiohttp/web_request.py	98.94% <100%> (+0.01%)	⬆️
aiohttp/test_utils.py	98.6% <100%> (ø)	⬆️
aiohttp/payload.py	98.94% <0%> (+0.08%)	⬆️

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