To support flutter test which require quiver ^0.24.0

[yathit]

Upgrading Flutter from /Users/mbikyaw/flutter/flutter...
Already up-to-date.

Upgrading engine...
Already up-to-date.

Flutter • channel alpha • https://github.com/flutter/flutter.git
Framework • revision 1c372c6803 (4 days ago) • 2017-08-31 15:54:45 -0700
Engine • revision f9e00a7c72
Tools • Dart 1.25.0-dev.11.0

Running "flutter packages upgrade" in sugar-mobile...
Incompatible version constraints on quiver:
- flutter_test 0.0.12 depends on version ^0.24.0
- sentry 0.0.1 depends on version >=0.25.0 <2.0.0
pub upgrade failed (1)

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[Hixie]

@yjbanov Can you see if this change makes sense and if so land it? Thanks.

[yjbanov]

Flutter has been upgraded to quiver 0.26.0. This should no longer be necessary.