language: ruby
sudo: false
rvm:
  - 1.8.7
  - ree
  - 1.9.3
  - 2.0
  - 2.1
  - 2.2
  - 2.3
  - 2.4
  - 2.5
  - 2.6
  - 2.7
  - ruby-head
matrix:
  allow_failures:
    - rvm: ruby-head
before_install:
  - gem update --system --conservative || gem install --conservative bundler -v '<2'
before_script:
  - rake compile
