sudo: false
language: ruby
rvm:
  - ree
  - 1.9.3
  - 2.5.1
notifications:
  email: false

sudo: false
language: ruby
rvm:
  - ree
  - 1.9.3
  - 2.5.1
notifications:
  email: false
before_install:
  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
  - gem install bundler -v '< 2'

Use bundler < 2 for Travis CI
Use bundler < 2 for Travis CI

Otherwise it fails to work with this gem

Travis CI docs on this:
https://docs.travis-ci.com/user/languages/ruby/#bundler-20
