sudo: false
language: ruby
rvm:
  - 2.4.1
  - 2.0.0
before_install: gem install bundler -v 1.15.2

sudo: false
language: ruby
rvm:
  - 2.4.1
  - 2.5.0
  - 2.6.0
  - 2.7.0
before_install: gem install bundler

Add Ruby 2.5, 2.6 and 2.7 to test matrix & don't specify what bundler version to install
Add Ruby 2.5, 2.6 and 2.7 to test matrix & don't specify what bundler version to install
