Improve travis config

[chenrui333]

• dist upgrade (trusty to bionic)
• remove sudo flag (https://blog.travis-ci.com/2018-11-19-required-linux-infrastructure-migration)

If you currently specify sudo: false in your .travis.yml, we recommend removing that configuration soon.

• "1.14.x" (this would capture all go1.14 releases)

[codecov]

Codecov Report

Merging #24311 into master will increase coverage by 0.00%.
The diff coverage is n/a.

Impacted Files	Coverage Δ
terraform/evaluate.go	41.92% <0.00%> (+0.65%)	⬆️
dag/marshal.go	53.40% <0.00%> (+1.13%)	⬆️

[apparentlymart]

Hi @chenrui333! Thanks for working on this, and sorry for the slow response.

I'm sorry to say that we are currently in the process of transitioning from Travis-CI to CircleCI, and so our Travis-CI configuration will be removed in the near future once we've seen the CircleCI configuration is working well. CircleCI is now active on this repository and, at the time I'm writing this, currently running alongside Travis-CI while we finish the setup.

For that reason, we're unfortunately going to have to close this. I do appreciate you taking the time to make these updates, and I'm sorry it wasn't visible that a switch to a new CI system was in progress. 😖 Thanks for sharing these proposed changes!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.