fix short option parsing

[Roger-luo]

fix #211

[codecov]

Codecov Report

Base: 83.24% // Head: 83.53% // Increases project coverage by +0.29% 🎉

Coverage data is based on head (1cd9e7a) compared to base (ba45d81).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #221      +/-   ##
==========================================
+ Coverage   83.24%   83.53%   +0.29%     
==========================================
  Files          21       21              
  Lines        1540     1537       -3     
==========================================
+ Hits         1282     1284       +2     
+ Misses        258      253       -5     

Impacted Files	Coverage Δ
src/codegen/julia.jl	89.09% <100.00%> (+1.73%)	⬆️

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