Remove unneeded dart:async imports

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 MichaelRFairhurst closed 4 years ago

MichaelRFairhurst commented 4 years ago

Since Dart 2.1, Future and Stream have been exported from dart:core

Alternatively, if for some reason this package must continue to support Dart 2.0, we can make an exception for these internally.

kevmoo commented 4 years ago

Need to update min SDK tested in .travis.yml

MichaelRFairhurst commented 4 years ago

Done!