[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 khindenburg@…):

 Perhaps a better way would be to add a variant like +matplotlib which
 would add the dependency to it.

 Also if htseq-qa doesn't work w/o matplotlib then that should be only
 installed if above variant is used.

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Ticket URL: <https://trac.macports.org/ticket/50120#comment:2>
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