Add the limit option for pagination

[alexcanessa]

Resolves #69

[codecov-io]

Codecov Report

Merging #94 into master will increase coverage by 0.11%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   80.72%   80.83%   +0.11%     
==========================================
  Files           7        7              
  Lines         332      334       +2     
==========================================
+ Hits          268      270       +2     
  Misses         64       64

Impacted Files	Coverage Δ
lib/_options.js	100% <ø> (ø)	⬆️
lib/src/Gren.js	77.72% <75%> (+0.2%)	⬆️

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