language: ruby
before_install:
  - gem install bundler # the default bundler version on travis is very old and causes 1.9.3 build issues
rvm:
  - 1.9.3
  - jruby-1.7.26
  - 2.0.0
  - 2.1.10
  - 2.2.6
  - 2.3.3
  - 2.4.0
  - jruby-9.1.7.0

language: ruby
before_install:
  - gem install bundler # the default bundler version on travis is very old and causes 1.9.3 build issues
rvm:
  - 1.9.3
  - jruby-1.7.26
  - 2.0.0
  - 2.1.10
  - 2.2.6
  - 2.3.3
  - 2.4.0
  - jruby-9.1.7.0
  - rbx-3

Add Rubinius to test matrix again
Add Rubinius to test matrix again

Based on https://travis-ci.org/rubinius/travis-canary/builds/199402063
it looks like `rbx` doesn't work, but `rbx-3` does.
