renamed short flag for extensions to match fd

[bzimmer]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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❗ Current head 95f6a6d differs from pull request most recent head af9a275

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #96   +/-   ##
=======================================
  Coverage        ?   81.72%           
=======================================
  Files           ?       15           
  Lines           ?     1390           
  Branches        ?        0           
=======================================
  Hits            ?     1136           
  Misses          ?      203           
  Partials        ?       51           

Files	Coverage Δ
up.go	85.84% <100.00%> (ø)

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