sudo: false
language: ruby
rvm:
  - 2.3.1
before_install: gem install bundler -v 1.13.6

sudo: false
language: ruby
rvm:
  - 2.2.6
  - 2.3.3
  - jruby-9.1.6.0
before_install: gem install bundler -v 1.13.6

Add more Ruby versions to Travis CI
Add more Ruby versions to Travis CI