[MacPorts] #58180: Update pandoc port

[MacPorts]

#58180: Update pandoc port
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 Reporter:  xleafr  |      Owner:  (none)
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:  MacPorts Future
Component:  ports   |    Version:  2.5.4
 Keywords:  pandoc  |       Port:  pandoc
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 The pandoc port is quite out of date. It is on version 1.12.4.2, which is
 from May 14, 2014. I think it should be updated to the latest version (2.7
 as of my writing this).

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Ticket URL: <https://trac.macports.org/ticket/58180>
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