language: ruby
rvm:
  - 2.4.0
gemfile:
  - .gemfiles/5.1.gemfile
before_install:
  - gem install bundler

language: ruby
rvm:
  - 2.4
  - 2.5
gemfile:
  - .gemfiles/5.1.gemfile
before_install:
  - gem install bundler

Use latest Ruby patch version on Travis.
Use latest Ruby patch version on Travis.
