Add -t to check/list/graph test dependencies

[frapposelli]

Fixes: #49

[codecov]

Codecov Report

Merging #50 (1b6c266) into master (dc59aff) will increase coverage by 0.17%.
The diff coverage is 62.50%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   54.10%   54.27%   +0.17%     
==========================================
  Files           3        3              
  Lines         268      269       +1     
==========================================
+ Hits          145      146       +1     
  Misses        102      102              
  Partials       21       21              

Impacted Files	Coverage Δ
walker.go	54.24% <60.00%> (+0.30%)	⬆️
cli.go	51.88% <66.66%> (ø)

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