Add MapValue method to Option

[yonesko]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.47%. Comparing base (f843ec6) to head (7b1f4d4).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
option.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   75.45%   75.47%   +0.01%     
==========================================
  Files          16       16              
  Lines        1422     1427       +5     
==========================================
+ Hits         1073     1077       +4     
- Misses        326      327       +1     
  Partials       23       23              

Flag	Coverage Δ
unittests	75.47% <80.00%> (+0.01%)	⬆️

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