Support content-type parameters with parameters

[olipratt]

Should address #3

[codecov-io]

Codecov Report

Merging #5 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #5   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          14     14           
  Lines         496    496           
=====================================
  Hits          496    496

Impacted Files	Coverage Δ
swaggerconformance/_basictests.py	100% <100%> (ø)	⬆️

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