Api extension

[alecloudenback]

closes #44

[codecov]

Codecov Report

Merging #45 (e1f8cbf) into master (7380710) will increase coverage by 0.76%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   90.07%   90.84%   +0.76%     
==========================================
  Files           2        2              
  Lines         131      142      +11     
==========================================
+ Hits          118      129      +11     
  Misses         13       13              

Flag	Coverage Δ
unittests	90.84% <100.00%> (+0.76%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/LifeContingencies.jl	96.99% <100.00%> (+0.27%)	⬆️

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