VCR set stubbed response handler fix.

[parfeon]

When cassette is playing, there is step of response setting. setResponse in NSURLSessionTask not get called for certain responses (those, for which Content-Type is something other than application/json).
With this fix, response setting handler has been moved from NSURLSessionTask to NSURLSessionConnection.

[codecov-io]

Codecov Report

Merging #5 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
+ Coverage   97.82%   97.82%   +<.01%     
==========================================
  Files          40       40              
  Lines        3488     3492       +4     
==========================================
+ Hits         3412     3416       +4     
  Misses         76       76

Impacted Files	Coverage Δ
...sc/Categories/NSURLSessionConnection+YHVRecorder.m	100% <100%> (ø)	⬆️
...VCR/Misc/Categories/NSURLSessionTask+YHVRecorder.m	90% <100%> (-0.63%)	⬇️

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