language: ruby
cache: bundler
rvm:
  - 2.6
  - 2.7
  - 3.0
script: bundle exec rake test
env:
  - REPORTER=default

language: ruby
cache: bundler
rvm:
  - 2.7
  - 3.0
  - 3.1
script: bundle exec rake test
env:
  - REPORTER=default

Add Ruby 3.1 to continuous integration build
Add Ruby 3.1 to continuous integration build

This commit removes Ruby 2.6.x from the Travis build. This isn't because
it no longer works, but because I've decided to aim to support the three
most recent releases of Ruby.
