sudo: false
language: ruby
rvm:
  - 2.2.4
before_install: gem install bundler -v 1.12.5

sudo: false
cache: bundler
language: ruby
rvm:
  - 2.2.7
  - 2.3.4
  - 2.4.1
before_install: gem install bundler -v 1.15.1

Update CI configs for latest Ruby
Update CI configs for latest Ruby
