Parse JSON responses from @response or @transformer correctly

[shalvah]

No description provided.

[codecov-io]

Codecov Report

Merging #321 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #321      +/-   ##
============================================
+ Coverage     81.89%   81.94%   +0.04%     
- Complexity      237      239       +2     
============================================
  Files             7        7              
  Lines           740      742       +2     
============================================
+ Hits            606      608       +2     
  Misses          134      134

Impacted Files	Coverage Δ	Complexity Δ
...rc/Mpociot/ApiDoc/Generators/AbstractGenerator.php	91.77% <100%> (+0.04%)	110 <3> (+2)	⬆️

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