Fixed "Content-Type multipart/form-data"

[StefH]

#248

[codecov]

Codecov Report

Merging #249 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
+ Coverage   89.61%   89.64%   +0.03%     
==========================================
  Files         102      102              
  Lines        4999     5014      +15     
==========================================
+ Hits         4480     4495      +15     
  Misses        519      519

Impacted Files	Coverage Δ
src/WireMock.Net/Util/BodyParser.cs	97.29% <100%> (+0.42%)	⬆️

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