Fix body matcher for chunked requests (fixes #734)

[hartwork]

Fixes #734

[codecov-commenter]

Codecov Report

Merging #739 (e69b10c) into master (4f70152) will decrease coverage by 0.54%.
The diff coverage is 66.66%.

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@@            Coverage Diff             @@
##           master     #739      +/-   ##
==========================================
- Coverage   90.52%   89.98%   -0.54%     
==========================================
  Files          28       28              
  Lines        1794     1838      +44     
  Branches      322      338      +16     
==========================================
+ Hits         1624     1654      +30     
- Misses        135      140       +5     
- Partials       35       44       +9     

Impacted Files	Coverage Δ
vcr/matchers.py	84.61% <66.66%> (-10.74%)	⬇️

... and 1 file with indirect coverage changes

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[sathieu]

Thanks @hartwork !