[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      |
---------------------+-----------------

Comment (by JacksonIsaac):

 Attached the diff for go1.8. If the port maintainer agrees I would be
 happy to help and be the co-maintainer of go.

--
Ticket URL: <https://trac.macports.org/ticket/53598#comment:2>
MacPorts <https://www.macports.org/>
Ports system for macOS