[Don't merge] Update ruby 2.3.n and 2.4.n in Travis CI
Created by: kachick
Just testing https://github.com/rspec/rspec-dev/pull/189
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: kachick
Just testing https://github.com/rspec/rspec-dev/pull/189