Fix BodyAsJson transform bug in ResponseMessageTransformer

[ghost]

Fix ResponseMessageTransformer to not replace BodyAsJson in an original message with transformed results

[codecov]

Codecov Report

Merging #261 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #261   +/-   ##
=======================================
  Coverage   89.78%   89.78%           
=======================================
  Files         103      103           
  Lines        5147     5147           
=======================================
  Hits         4621     4621           
  Misses        526      526

Impacted Files	Coverage Δ
...ock.Net/Transformers/ResponseMessageTransformer.cs	100% <100%> (ø)	⬆️

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[ghost]

Want to mention that it means that if a consumer uses BadyAsJson with any handlebars functionality (transformer) it will work properly the first time, but then it will return the same response body for all next requests instead of generating them with transformers.

[StefH]

I think I understand your issue. However, can you maybe create a unit-test to test this behaviour.