Add Option[A]

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[codecov]

Codecov Report

Merging #28 (1d4ef1b) into master (b1fe85f) will increase coverage by 0.10%.
The diff coverage is 86.48%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   83.47%   83.58%   +0.10%     
==========================================
  Files          29       30       +1     
  Lines        1029     1066      +37     
==========================================
+ Hits          859      891      +32     
- Misses        151      155       +4     
- Partials       19       20       +1     

Impacted Files	Coverage Δ
fun/fun.go	76.92% <0.00%> (-6.42%)	⬇️
option/option.go	91.42% <91.42%> (ø)

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