MatcherMapper : Always use Pattern

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #716 (3e02ca6) into master (288a50c) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master     #716   +/-   ##
=======================================
  Coverage   75.65%   75.65%           
=======================================
  Files         175      175           
  Lines        6337     6337           
  Branches      646      646           
=======================================
  Hits         4794     4794           
  Misses       1349     1349           
  Partials      194      194           

Impacted Files	Coverage Δ
src/WireMock.Net/Serialization/MatcherMapper.cs	89.38% <50.00%> (ø)

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