[MacPorts] #53468: protobuf3-cpp @3.0.0: update to 3.1.0

[MacPorts]

#53468: protobuf3-cpp @3.0.0: update to 3.1.0
----------------------------+----------------------
  Reporter:  l2dy           |      Owner:  blair
      Type:  update         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  protobuf3-cpp  |
----------------------------+----------------------
Changes (by mf2k):

 * cc: blair (removed)
 * owner:   => blair
 * status:  new => assigned


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Ticket URL: <https://trac.macports.org/ticket/53468#comment:1>
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