language: ruby
rvm:
  - 2.1
  - 2.2
  - 2.3
matrix:
  allowed_failures:
    - rvm: ruby-head

language: ruby
rvm:
  - 2.1.10
  - 2.2
  - 2.3
matrix:
  allowed_failures:
    - rvm: ruby-head

Use the latest Ruby 2.1.x
Use the latest Ruby 2.1.x

  - Older versions of Ruby 2.1.x might install an buggy bundler which
    fails builds
    - https://github.com/simeonwillbanks/busted/pull/15#issuecomment-249085408
