Async dns error

[asvetlov]

Fix for #2231

[codecov-io]

Codecov Report

Merging #2237 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2237      +/-   ##
==========================================
+ Coverage   97.15%   97.15%   +<.01%     
==========================================
  Files          39       39              
  Lines        7901     7913      +12     
  Branches     1369     1371       +2     
==========================================
+ Hits         7676     7688      +12     
  Misses        100      100              
  Partials      125      125

Impacted Files	Coverage Δ
aiohttp/resolver.py	100% <100%> (ø)	⬆️

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