Ignore unknown cli args

[parente]

• For backward compat with -y/--yes
• Fix argv parsing by leaving off the script

[codecov]

Codecov Report

Merging #6 into master will not change coverage.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   78.84%   78.84%           
=======================================
  Files           2        2           
  Lines          52       52           
=======================================
  Hits           41       41           
  Misses         11       11

Impacted Files	Coverage Δ
kernda/cli.py	77.55% <100%> (ø)	✅

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