update kingpin to v2

[rrotter]

Among other updates, the latest kingpin includes several fixes to zsh completion.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.26%. Comparing base (99d6fe4) to head (4569824).
Report is 121 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1384       +/-   ##
===========================================
- Coverage   42.19%   28.26%   -13.94%     
===========================================
  Files          54       70       +16     
  Lines        6456    12480     +6024     
===========================================
+ Hits         2724     3527      +803     
- Misses       3283     8479     +5196     
- Partials      449      474       +25     

Flag	Coverage Δ
unittests	28.26% <ø> (-13.94%)	⬇️

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[tinaboyce]

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