Don't uppercase HTTP verb in parser

[asvetlov]

RFC 7320 sec. 3.1.1:

The request method is case sensitive

[webknjaz]

Perfect. Now it's more RFC-compliant :)

[codecov-io]

Codecov Report

Merging #3233 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3233      +/-   ##
==========================================
- Coverage   98.07%   98.07%   -0.01%     
==========================================
  Files          43       43              
  Lines        7857     7856       -1     
  Branches     1354     1354              
==========================================
- Hits         7706     7705       -1     
  Misses         59       59              
  Partials       92       92

Impacted Files	Coverage Δ
aiohttp/http_parser.py	98.06% <ø> (-0.01%)	⬇️

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[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new