tree c82ed0845b04fc34624d5f2f423fc490eb03bcf1
parent 85fcb605844bd414e433993484864c55cabfdb90
author Nate Bosch <nbosch1@gmail.com> 1604442789 -0800
committer GitHub <noreply@github.com> 1604442789 -0800

Bump SDK constraints for pub (dart-lang/stream_channel#67)

Use a 2.12.0 lower bound since pub does not understand allowed
experiments for earlier versions.

Use a 3.0.0 upper bound to avoid a warning in pub and to give some
flexibility in publishing for stable.