fix panic on named types

[ilackarms]

fixes if a struct contains a named/assigned type (#25)

[codecov]

Codecov Report

Merging #26 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   97.82%   97.82%   +<.01%     
==========================================
  Files           8        8              
  Lines         367      368       +1     
==========================================
+ Hits          359      360       +1     
  Misses          4        4              
  Partials        4        4

Impacted Files	Coverage Δ
faker.go	95.23% <100%> (+0.02%)	⬆️

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