Printing the constructor name for non-plain objects

[DanielSWolf]

Fixes #14

[codecov[bot]]

Codecov Report

Merging #15 into master will decrease coverage by 2.77%. The diff coverage is 70.83%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   98.14%   95.37%   -2.77%     
==========================================
  Files           2        2              
  Lines         216      238      +22     
  Branches       82       98      +16     
==========================================
+ Hits          212      227      +15     
- Misses          4       11       +7     

Impacted Files	Coverage Δ
index.js	95.35% <70.83%> (-2.79%)	:arrow_down:

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