language: ruby
rvm:
  - ruby-head
  - 2.2.3
  - 2.2.0
  - 2.1.4
  - 2.1.0
  - 2.0.0
  - 1.9.3
  - 1.9.2
  - 1.8.7
  - ree
matrix:
  allow_failures:
    - rvm: ruby-head