[MacPorts] #39596: py-ntplib: update to 0.3.0

[MacPorts]

#39596: py-ntplib: update to 0.3.0
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  Reporter:  jmr@…      |      Owner:  jason-macports@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  py-ntplib  |
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Comment (by jmr@…):

 Also, this doesn't appear to use setuptools at all, so the dependency
 should be removed.

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Ticket URL: <https://trac.macports.org/ticket/39596#comment:1>
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