language: ruby
cache: bundler
rvm:
  - 2.0.0
  - 2.1.7
  - 2.2.3
before_install: gem install bundler -v 1.10.6

language: ruby
cache: bundler
rvm:
  - 2.0.0
  - 2.1.10
  - 2.2.7
  - 2.3.4
  - 2.4.1
before_install: gem install bundler -v 1.14.6

Update Ruby versions Travis tests against
Update Ruby versions Travis tests against

Ruby 2.0 and 2.1 are now EOL, so change the Ruby versions we're testing
against to be the most recent versions of 2.2, 2.3 and 2.4, which are
the current supported patch levels.
