Bug 1930948 - Switch to more recent cli lib

[willdurand]

See: urfave/cli#539

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 58.33%. Comparing base (1700f53) to head (09dc8aa).

Files with missing lines	Patch %	Lines
main.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #401      +/-   ##
==========================================
- Coverage   58.61%   58.33%   -0.28%     
==========================================
  Files           5        5              
  Lines         418      420       +2     
==========================================
  Hits          245      245              
- Misses        155      157       +2     
  Partials       18       18              

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[willdurand]

That's a lot of code for a cli lib...

[willdurand]

I'm not entirely happy about this PR but I'd rather keep up with the dep updates than do nothing. That said, I think - in the future - we might want to get rid of this dependency entirely.