[MacPorts] #53430: Please update swig-ruby to work with ruby-2.4

[MacPorts]

#53430: Please update swig-ruby to work with ruby-2.4
------------------------+-----------------------
 Reporter:  mouse07410  |      Owner:
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  swig-ruby
------------------------+-----------------------
 Current swig-ruby supports ruby up to 2.3.
 {{{
 swig-ruby @3.0.12_1 (devel)
 Variants:             ruby186, [+]ruby187, ruby19, ruby20, ruby21, ruby22,
 ruby23, universal
 . . . . .
 }}}

 Released stable ruby is 2.4 now. Could you please add 2.4 variant?

 Thanks!

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Ticket URL: <https://trac.macports.org/ticket/53430>
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