sudo: false
language: ruby
rvm:
  - 2.1.10
  - 2.2.7
  - 2.3.4
  - 2.4.1
before_install: gem install bundler -v 1.15.3

sudo: false
language: ruby
rvm:
  - 2.2.9
  - 2.3.6
  - 2.4.3
  - 2.5.0
before_install: gem install bundler -v 1.16.1

Remove support for Ruby 2.1 and add support for 2.5.
Remove support for Ruby 2.1 and add support for 2.5.
