Fix nested arrays

[drwpow]

Fixes #46

[codecov]

Codecov Report

Merging #54 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   97.93%   97.97%   +0.04%     
==========================================
  Files           2        2              
  Lines          97       99       +2     
  Branches       37       38       +1     
==========================================
+ Hits           95       97       +2     
  Misses          2        2

Impacted Files	Coverage Δ
src/swagger-2.ts	97.84% <100%> (+0.04%)	⬆️

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