This PR migrates the CI pipeline from the no longer functioning Travis CI.org to GitHub Actions.
Dependency gem versions in the gemspec are loosened, to allow running against more recent versions. CI includes tests against versions from Ruby 2.3 to 3.1. Ruby 2.3 is the earliest version that supports the previously specified version of Rubocop.
This PR migrates the CI pipeline from the no longer functioning Travis CI.org to GitHub Actions.
Dependency gem versions in the gemspec are loosened, to allow running against more recent versions. CI includes tests against versions from Ruby 2.3 to 3.1. Ruby 2.3 is the earliest version that supports the previously specified version of Rubocop.
Rubocop is also added as a CI task.
This runs green on my fork.