[MacPorts] #47909: p5-graphviz: update to version 2.18.

[MacPorts]

#47909: p5-graphviz: update to version 2.18.
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  Reporter:  devans@…     |      Owner:  ryandesign@…
      Type:  update       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.3
Resolution:               |   Keywords:
      Port:  p5-graphviz  |
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Changes (by ryandesign@…):

 * status:  new => assigned


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Ticket URL: <https://trac.macports.org/ticket/47909#comment:1>
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