branches:
  only:
    - master
language: ruby
matrix:
  allow_failures:
    - rvm: ruby-head
rvm:
  - 1.9.3
  - 2.0.0
  - 2.1
  - 2.2
  - ruby-head

branches:
  only:
    - master
language: ruby
matrix:
  allow_failures:
    - rvm: ruby-head
rvm:
  - 1.9.3
  - 2.0.0
  - 2.1
  - 2.2
  - 2.3
  - ruby-head

Add Ruby 2.3 to the Travis test matrix.
Add Ruby 2.3 to the Travis test matrix.

Good to be testing all supported versions of Ruby.
