[MacPorts] #39641: py-pyro: update to 4.20

[MacPorts]

#39641: py-pyro: update to 4.20
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  Reporter:  jmr@…    |      Owner:  macports-tickets@…
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  py-pyro  |
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Comment (by smithsp@…):

 This ticket depends on
 http://trac.macports.org/ticket/40014
 to add the py-serpent port.

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Ticket URL: <https://trac.macports.org/ticket/39641#comment:5>
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