[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:
 Keywords:  haspatch maintainer  |       Port:  py-htseq
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Ticket URL: <https://trac.macports.org/ticket/50120>
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