Unify configs

[asvetlov]

Merge pytest.ini into setup.cfg, fix CI blames

[codecov-io]

Codecov Report

Merging #4394 into master will decrease coverage by 0.44%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4394      +/-   ##
==========================================
- Coverage   97.52%   97.08%   -0.45%     
==========================================
  Files          43       43              
  Lines        8861     8861              
  Branches     1389     1389              
==========================================
- Hits         8642     8603      -39     
- Misses         95      136      +41     
+ Partials      124      122       -2

Impacted Files	Coverage Δ
aiohttp/tcp_helpers.py	66.66% <0%> (-26.67%)	⬇️
aiohttp/http_parser.py	92.2% <0%> (-4.68%)	⬇️
aiohttp/http_writer.py	95.28% <0%> (-3.78%)	⬇️
aiohttp/worker.py	94.11% <0%> (-2.53%)	⬇️
aiohttp/web_fileresponse.py	97.72% <0%> (-0.57%)	⬇️
aiohttp/helpers.py	95.62% <0%> (-0.49%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bbe5279...cc87add. Read the comment docs.