[MacPorts] #51994: Add py-filterpy port.

[MacPorts]

#51994: Add py-filterpy port.
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  Reporter:  KubaO        |      Owner:  macports-tickets@…
      Type:  submission   |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:  py-filterpy  |
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Comment (by mf2k):

 Can we use your GitHub handle in the maintainers?
 {{{
 maintainers         @KubaO openmaintainer
 }}}

 I would also like to remove py34 and py35. I think we should only support
 the latest python versions moving forward unless there is a specific needs
 for the older pythons.

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Ticket URL: <https://trac.macports.org/ticket/51994#comment:2>
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