language: ruby
rvm:
  - 1.9.3
  - 2.1
  - rbx
matrix:
  allow_failures:
    - rvm: rbx

language: ruby
rvm:
  - 2.1
  - 2.3
  - 2.4

Test against newer Rubies; stop testing ancient 1.9.
Test against newer Rubies; stop testing ancient 1.9.
