Drop py_35 constant

[asvetlov]

No description provided.

[codecov-io]

Codecov Report

Merging #2363 into master will increase coverage by 0.21%.
The diff coverage is 93.05%.

@@            Coverage Diff             @@
##           master    #2363      +/-   ##
==========================================
+ Coverage   96.96%   97.17%   +0.21%     
==========================================
  Files          39       39              
  Lines        8199     8180      -19     
  Branches     1437     1419      -18     
==========================================
- Hits         7950     7949       -1     
  Misses        101      101              
+ Partials      148      130      -18

Impacted Files	Coverage Δ
aiohttp/web_urldispatcher.py	99.33% <100%> (+0.16%)	⬆️
aiohttp/client_reqrep.py	97.35% <100%> (+0.19%)	⬆️
aiohttp/test_utils.py	98.58% <100%> (+0.69%)	⬆️
aiohttp/streams.py	99.06% <100%> (+0.69%)	⬆️
aiohttp/helpers.py	97.16% <100%> (+0.22%)	⬆️
aiohttp/multipart.py	95.42% <77.27%> (+0.52%)	⬆️
examples/web_ws.py	94.84% <0%> (+0.37%)	⬆️
examples/client_ws.py	96.42% <0%> (+0.48%)	⬆️
tests/autobahn/client.py	94.92% <0%> (+1.31%)	⬆️

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[new issue]: https://github.com/aio-libs/aiohttp/issues/new