[MacPorts] #54525: pngquant @2.1.0 is very outdated

[MacPorts]

#54525: pngquant @2.1.0 is very outdated
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 Reporter:  grr     |      Owner:
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  pngquant
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 2.1.0 is over 3 years old (released 02/26/2014). The current version is
 2.10.1 (released 07/09/2017).

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Ticket URL: <https://trac.macports.org/ticket/54525>
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