Update example to use unified `dart` tool

dart-lang / io

Utilities for the Dart VM's dart:io.

https://pub.dev/packages/io

BSD 3-Clause "New" or "Revised" License

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Closed mit-mit closed 3 years ago

mit-mit commented 3 years ago

Also, while I'm here, roll to package:lints

mit-mit commented 3 years ago

@kevmoo can I have LGTM?

kevmoo commented 3 years ago

I'd rather you just update the command bits and leave the lints for later.