[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 sean@…):

 Replying to [comment:3 aronnax@…]:
 > This builds for me. Any input from the maintainer?

 Sorry for the delay; I've been traveling and haven't had time to look at
 this. I'll try to update this shortly.

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Ticket URL: <https://trac.macports.org/ticket/40802#comment:4>
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