[MacPorts] #32367: py-matplotlib: Add license

[MacPorts]

#32367: py-matplotlib: Add license
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 Reporter:  eborisch@…             |       Owner:  ram@…           
     Type:  defect                 |      Status:  new             
 Priority:  Normal                 |   Milestone:                  
Component:  ports                  |     Version:  2.0.3           
 Keywords:                         |        Port:  py-matplotlib   
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Comment(by ram@…):

 I'll try and get round to this over the weekend, but feel free to add the
 appropriate information yourself if you have the time.

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Ticket URL: <https://trac.macports.org/ticket/32367#comment:2>
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