[MacPorts] #40802: py-matplotlib: update to 1.3.1

[MacPorts]

#40802: py-matplotlib: update to 1.3.1
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  Reporter:  aronnax@…      |      Owner:  sean@…
      Type:  update         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.2.0
Resolution:                 |   Keywords:
      Port:  py-matplotlib  |
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Comment (by Peter.Danecek@…):

 I'd say matplotlib is now `py-matplotlib @1.3.1_1`, so this ticket just
 needs closing. Or is there a reason to keep it open?

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Ticket URL: <https://trac.macports.org/ticket/40802#comment:6>
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