rvm:
  - 1.9.3
  - 2.1.0
  - 2.2.0

rvm:
  - 1.9.3
  - 2.1.0
  - 2.2.0
sudo: false

Switch Travis to use container-based infrastructure
Switch Travis to use container-based infrastructure

Addresses #110

Instructions: https://docs.travis-ci.com/user/migrating-from-legacy/?utm_source=legacy-notice&utm_medium=banner&utm_campaign=legacy-upgrade
