[MacPorts] #56833: py-Pillow: Update to 5.2.0, add Python 3.7

[MacPorts]

#56833: py-Pillow: Update to 5.2.0, add Python 3.7
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 Reporter:  radarhere    |      Owner:  stromnov
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  py-Pillow
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 If Pillow could be updated to 5.2.0, and a Python 3.7 subport added, that
 would be good. Thanks

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Ticket URL: <https://trac.macports.org/ticket/56833>
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