[MacPorts] #58097: carthage @0.31.2: add shell completions

[MacPorts]

#58097: carthage @0.31.2: add shell completions
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  Reporter:  FranklinYu   |      Owner:  saagarjha
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  carthage     |
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Comment (by saagarjha):

 Thanks for the ping; I've filed a pull request
 ([https://github.com/macports/macports-ports/pull/4019]). I haven't really
 tested the zsh and fish completions, since I don't use those shells, but I
 think they should work.

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Ticket URL: <https://trac.macports.org/ticket/58097#comment:8>
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