[3.6] Enable windows CI (#4176).

[asvetlov]

(cherry picked from commit bbaf125)

Co-authored-by: Andrew Svetlov [email protected]

[codecov-io]

Codecov Report

Merging #4183 into 3.6 will decrease coverage by 0.5%.
The diff coverage is 93.62%.

@@            Coverage Diff             @@
##              3.6    #4183      +/-   ##
==========================================
- Coverage   98.07%   97.56%   -0.51%     
==========================================
  Files          44       43       -1     
  Lines        8871     8825      -46     
  Branches     1390     1381       -9     
==========================================
- Hits         8700     8610      -90     
- Misses         67       93      +26     
- Partials      104      122      +18

Impacted Files	Coverage Δ
aiohttp/streams.py	97.4% <ø> (-0.55%)	⬇️
aiohttp/web.py	99.04% <ø> (-0.48%)	⬇️
aiohttp/worker.py	96.63% <ø> (-0.91%)	⬇️
aiohttp/client_exceptions.py	100% <ø> (ø)	⬆️
aiohttp/__init__.py	100% <100%> (ø)	⬆️
aiohttp/web_response.py	97.69% <100%> (-0.5%)	⬇️
aiohttp/cookiejar.py	100% <100%> (ø)	⬆️
aiohttp/web_urldispatcher.py	99.09% <100%> (-0.02%)	⬇️
aiohttp/helpers.py	96.58% <100%> (-0.19%)	⬇️
aiohttp/resolver.py	100% <100%> (ø)	⬆️
... and 32 more

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