Fix ResponseMessageTransformer (#188)

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #190 into master will increase coverage by 0.26%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #190      +/-   ##
==========================================
+ Coverage   72.26%   72.52%   +0.26%     
==========================================
  Files          89       89              
  Lines        3245     3247       +2     
  Branches      422      422              
==========================================
+ Hits         2345     2355      +10     
+ Misses        731      725       -6     
+ Partials      169      167       -2

Impacted Files	Coverage Δ
...ock.Net/Transformers/ResponseMessageTransformer.cs	91.46% <75%> (+10.21%)	⬆️

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