[MacPorts] #52469: Rust update to 1.13 (was: Rust update to 1.12)

[MacPorts]

#52469: Rust update to 1.13
---------------------+----------------------
  Reporter:  jboone  |      Owner:  g5pw
      Type:  update  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.3.4
Resolution:          |   Keywords:  haspatch
      Port:  rust    |
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Comment (by raimue):

 Rust [https://blog.rust-lang.org/2016/11/10/Rust-1.13.html 1.13] is out.

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Ticket URL: <https://trac.macports.org/ticket/52469#comment:4>
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