language: ruby
rvm:
  - 1.9.3

language: ruby
rvm:
  - 1.9.3
  - 2.0.0
  - 2.1.0
  - 2.2.0

Test against more Ruby versions
Test against more Ruby versions

Ubuntu 12.04 uses 1.9.3, but Ubuntu 14.04 uses 2.0.0 and it's reasonable to
expect that this will run on other versions too.
