Pre-defined named arguments for Pluraization

[exoego]

Closes #67

[codecov-io]

Codecov Report

Merging #440 into dev will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev     #440      +/-   ##
==========================================
+ Coverage   95.91%   95.93%   +0.01%     
==========================================
  Files           9        9              
  Lines         637      640       +3     
==========================================
+ Hits          611      614       +3     
  Misses         26       26

Impacted Files	Coverage Δ
src/index.js	99.58% <100%> (ø)	⬆️
src/format.js	100% <0%> (ø)	⬆️

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[kazupon]

Thanks !
Great works!!!!!