sudo: false
language: ruby
rvm:
  - 2.4.1
before_install: gem install bundler -v 1.16.0.pre.2

sudo: false
language: ruby
rvm:
  - 2.3.6
  - 2.4.3
  - 2.5.0
before_install: gem install bundler -v 1.16.0

Update TravisCI config to run specs on all supported rubies
Update TravisCI config to run specs on all supported rubies
