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

[MacPorts]

#57749: @dart-sdk @2.0.0: request upgrade to @2.1.0
----------------------------+----------------------
 Reporter:  AlexAkhremenko  |      Owner:  (none)
     Type:  update          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.5.4
 Keywords:                  |       Port:  dart-sdk
----------------------------+----------------------
 [https://github.com/dart-lang/sdk/blob/master/CHANGELOG.md#210---
 2018-11-15]

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