remove stdin default from create-countries subcommand

[elfkuzco]

Changes

• Remove stdin default from create-countries subcommand.

This resolves #44

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.66%. Comparing base (0c088e1) to head (93da9ba).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #45   +/-   ##
=======================================
  Coverage   69.66%   69.66%           
=======================================
  Files          30       30           
  Lines         946      946           
  Branches       93       93           
=======================================
  Hits          659      659           
  Misses        267      267           
  Partials       20       20           

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[elfkuzco]

Um, should I do this for the create-worker sub-command too? Just remembered it reads the public key from stdin too.

[rgaudin]

LGTM