[MacPorts] #58509: R: update to 3.6.0

[MacPorts]

#58509: R: update to 3.6.0
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 Reporter:  stanimura  |      Owner:  (none)
     Type:  update     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  R
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 R version 3.6.0 has been released on 2019-04-26.

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Ticket URL: <https://trac.macports.org/ticket/58509>
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