language: ruby
rvm:
  - 2.1
  - 2.2
  - 2.3.0
  - 2.3.1

branches:
  only:
    - master

language: ruby
rvm:
  - 2.1
  - 2.2
  - 2.3.0
  - 2.3.1
  - 2.3.2
  - 2.3.3

branches:
  only:
    - master

Add ruby versions to Travis.
Add ruby versions to Travis.
