[MacPorts] #57749: dart-sdk @2.0.0: update to 2.1.0

[MacPorts]

#57749: dart-sdk @2.0.0: update to 2.1.0
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  Reporter:  AlexAkhremenko  |      Owner:  (none)
      Type:  update          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  dart-sdk        |
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Comment (by AlexAkhremenko):

 Patch file with update has been added

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Ticket URL: <https://trac.macports.org/ticket/57749#comment:3>
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