When posting new mapping, use DateParseHandling.None

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #348 into master will increase coverage by 0.03%.
The diff coverage is 73.91%.

@@            Coverage Diff             @@
##           master     #348      +/-   ##
==========================================
+ Coverage   80.29%   80.33%   +0.03%     
==========================================
  Files         112      112              
  Lines        4450     4459       +9     
==========================================
+ Hits         3573     3582       +9     
  Misses        877      877

Impacted Files	Coverage Δ
src/WireMock.Net/Util/BodyParser.cs	96.9% <100%> (+0.03%)	⬆️
src/WireMock.Net/RequestBuilders/Request.cs	96.15% <100%> (ø)	⬆️
src/WireMock.Net/Server/FluentMockServer.Admin.cs	62.87% <16.66%> (ø)	⬆️
src/WireMock.Net/Serialization/MatcherMapper.cs	84.05% <92.3%> (+2.09%)	⬆️

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