sudo: false
language: ruby
rvm:
  - 2.4.1
before_install: gem install bundler -v 1.15.4

sudo: false
language: ruby
rvm:
  - 2.3.4
  - 2.4.1
before_install: gem install bundler -v 1.15.4

Add ruby 2.3.4 for validation by Travis CI.
Add ruby 2.3.4 for validation by Travis CI.
