[MacPorts] #53256: py-gmpy2 @2.0.8: Add py36 subport

[MacPorts]

#53256: py-gmpy2 @2.0.8: Add py36 subport
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 Reporter:  mndavidoff           |      Owner:
     Type:  enhancement          |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:
 Keywords:  haspatch maintainer  |       Port:  py-gmpy2
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 The attached patch adds the py36-gmpy2 subport and updates the homepage
 per https://pypi.python.org/pypi/gmpy2.

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Ticket URL: <https://trac.macports.org/ticket/53256>
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