[MacPorts] #42759: R @3.0.2_1: upgrade to 3.0.3, simplify master_sites

[MacPorts]

#42759: R @3.0.2_1: upgrade to 3.0.3, simplify master_sites
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  Reporter:  kjell.konis@…  |      Owner:  larryv@…
      Type:  update         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:  fixed          |   Keywords:  haspatch maintainer
      Port:  R              |
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Comment (by kjell.konis@…):

 Sorry about that. Would it be ok to put 'revision 0' in the Portfile
 rather than delete the revision line entirely? I make this mistake a lot
 and I think if the revision were right below the major/minor/point I would
 see it when I am doing updates and that would (hopefully) jog my memory.

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Ticket URL: <https://trac.macports.org/ticket/42759#comment:3>
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