tree f42bd73ac65da99094f745082c025759e8f56411
parent d1cf199b07e4c220d0621e82fcda02891ec02754
author Kevin Moore <kevmoo@google.com> 1487091213 -0800
committer Kevin Moore <kevmoo@google.com> 1487091213 -0800

Fix travis by requiring 1.22.0

Fixes https://github.com/dart-lang/observable/issues/34