language: ruby
rvm:
  - 2.2
  - 2.1
  - 2.0.0
  - 1.9.3
  - 1.9.2

language: ruby
sudo: false
rvm:
  - 2.2
  - 2.1
  - 2.0.0
  - 1.9.3
  - 1.9.2

Use container-based infrastructure for Travis CI
Use container-based infrastructure for Travis CI

As specified in
https://github.com/bundler/bundler/issues/3558#issuecomment-171347979
