language: ruby
cache: bundler
rvm:
  - 1.9.3
  - 2.0.0
  - 2.1.0
  - 2.2.2
  - ruby-head
before_install:
  - "gem update --system"
  - "gem update bundler"

language: ruby
cache: bundler
rvm:
  - 2.2
  - 2.3
  - 2.4
  - 2.5
  - ruby-head
before_install:
  - "gem update --system"
  - "gem update bundler"

Switch Travis to only supported versions of Ruby
Switch Travis to only supported versions of Ruby