AF-2686 dart 2

[robbecker-wf]

Summary

Fixes for dart 2

• run travis on dart1 and dart2
• dart sdk range to include 1&2
• tweaked dependencies to remove non-dart2 deps

Testing

• CI passes

[aviary2-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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[corwinsheahan-wf]

QA +1

• Testing instruction
• Dev +1's
• Dev/QA +10 with detail of what was tested
  • CI Passes (dart 1 & 2)
• Security review (if required)
• Unit tests created/updated
• All unit tests pass
• Rosie has run and reports properly the release the ticket will be included in

Merging into master.
@Workiva/release-management-p