Phil Quitslund 803fbec51b Add Dart SDK to version info (#4986). (#5337)
* Add Dart SDK to version info (#4986).

Adds a new SDK line to the `flutter —version` output.

* Prefer `Platform.version`.

* Version text fixes.
2016-08-11 16:39:33 -07:00
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2016-07-27 12:43:56 -07:00