[MacPorts] #53598: go @1.7.4: update to 1.8

[MacPorts]

#53598: go @1.7.4: update to 1.8
---------------------+-----------------
  Reporter:  l2dy    |      Owner:
      Type:  update  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  go      |
---------------------+-----------------
Changes (by JacksonIsaac):

 * Attachment "Portfile-go.diff" added.

 Go: Update to 1.8. Add ijackson to port maintainer list.

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Ticket URL: <https://trac.macports.org/ticket/53598>
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