---
before_install:
  - gem install bundler
language: ruby
rvm:
  - 2.1.7
  - 2.2.3
  - 2.3.1
  - 2.4.1

---
before_install:
  - gem install bundler
language: ruby
rvm:
  - 2.5.8
  - 2.6.6
  - 2.7.1

Update build matrix to latest ruby versions
Update build matrix to latest ruby versions

This commit updates our travis CI build matrix to only test against the
currently supported major versions of ruby. Older versions of the gem
should continue to work on unsupported rubies.
