Add raw_path_qs attribute

[guyskk]

#136

[codecov]

Codecov Report

Merging #137 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
+ Coverage   99.62%   99.63%   +<.01%     
==========================================
  Files           2        2              
  Lines         538      542       +4     
  Branches      134      135       +1     
==========================================
+ Hits          536      540       +4     
  Partials        2        2

Impacted Files	Coverage Δ
yarl/__init__.py	100% <100%> (ø)	⬆️

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[asvetlov]

Thanks!