language: ruby
rvm:
  - 1.8.7
  - 1.9.2
  - 1.9.3
  - 2.0.0
  - 2.1.2
# uncomment this line if your project needs to run something other than `rake`:
# script: bundle exec rspec spec
language: ruby
rvm:
  - 1.8.7
  - 1.9.2
  - 1.9.3
  - 2.0.0
  - 2.1.8
  - 2.2.4
  - 2.3.0

sudo: false
# uncomment this line if your project needs to run something other than `rake`:
# script: bundle exec rspec spec

Add Ruby 2.2.4, 2.3.0 to Travis. Update to 2.1.8.
Add Ruby 2.2.4, 2.3.0 to Travis. Update to 2.1.8.

Also use containerized builds for Travis CI.