Proxy from env

[asvetlov]

Proxy environments support

Fix for #1998

[codecov-io]

Codecov Report

Merging #2256 into master will decrease coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2256      +/-   ##
==========================================
- Coverage    97.3%   97.25%   -0.05%     
==========================================
  Files          39       39              
  Lines        8051     8091      +40     
  Branches     1395     1408      +13     
==========================================
+ Hits         7834     7869      +35     
- Misses         94       97       +3     
- Partials      123      125       +2

Impacted Files	Coverage Δ
aiohttp/helpers.py	97.43% <100%> (+0.15%)	⬆️
aiohttp/client_reqrep.py	97.33% <100%> (-0.03%)	⬇️
tests/autobahn/client.py	94.5% <0%> (-1.24%)	⬇️

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[asvetlov]

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