[Chapel Merge] Remove .travis.yml

Branch: refs/heads/master
Revision: f6f49dc
Author: ronawho
Log Message:

Merge pull request #16654 from ronawho/remove-travis-yml

Remove .travis.yml

We’re using github actions instead of travis now, so remove the old yaml
file.

Modified Files:
R .travis.yml
M .github/workflows/CI.yml

Compare: https://github.com/chapel-lang/chapel/compare/5f34bcc519a5...f6f49dc9565d