language: ruby
rvm:
  - 2.2.5
before_install: gem install bundler -v 1.13.2

language: ruby
rvm:
  - 2.2.7
  - 2.3.4
  - 2.4.1
before_install: gem install bundler -v 1.15.4

Update Travis Ruby and bundler
Update Travis Ruby and bundler
