Feature/opt symlink

[otiai10]

Close #15 Close #16

[codecov-io]

Codecov Report

Merging #17 into master will decrease coverage by 0.66%.
The diff coverage is 86.66%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage      84%   83.33%   -0.67%     
==========================================
  Files           1        2       +1     
  Lines          50       72      +22     
==========================================
+ Hits           42       60      +18     
- Misses          4        6       +2     
- Partials        4        6       +2

Impacted Files	Coverage Δ
options.go	100% <100%> (ø)
copy.go	82.6% <85.18%> (-1.4%)	⬇️

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