sudo: false
language: ruby
cache: bundler
rvm:
  - 2.1.2
  - 2.2.4
  - 2.3.1
before_install:
  - gem install bundler

sudo: false
language: ruby
cache: bundler
rvm:
  - 2.1.2
  - 2.2.4
  - 2.3.1
before_install:
  - gem install bundler -v 1.16.3

Use Bundler version compatible with supported Ruby versions
Use Bundler version compatible with supported Ruby versions
