Add aliases for command arguments

[carlobaldassi]

Fix #59

[codecov-io]

Codecov Report

Merging #91 into master will increase coverage by 0.17%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   96.14%   96.31%   +0.17%     
==========================================
  Files           4        4              
  Lines        1140     1195      +55     
==========================================
+ Hits         1096     1151      +55     
  Misses         44       44

Impacted Files	Coverage Δ
src/settings.jl	96.36% <100%> (+0.24%)	⬆️
src/parsing.jl	96.91% <100%> (+0.09%)	⬆️

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