[MacPorts] #50120: py-htseq @0.6.1: add note about optional dependency matplotlib

[MacPorts]

#50120: py-htseq @0.6.1: add note about optional dependency matplotlib
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  Reporter:  davide.liessi@…  |      Owner:  macports-tickets@…
      Type:  enhancement      |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:  haspatch maintainer
      Port:  py-htseq         |
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Comment (by g5pw@…):

 I'm with davide on this one, I think adding a note and letting the user
 install matplotlib if they want more functionality is better.

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Ticket URL: <https://trac.macports.org/ticket/50120#comment:4>
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