rvm:
  - 2.0.0
  - 2.1.5
  - 2.2.0
cache: bundler
sudo: false 
rvm:
  - 2.1.0
  - 2.6.5
cache: bundler
sudo: false

Update Travis rubies to a larger "fork"
Update Travis rubies to a larger "fork"

We only need to ensure maximum backwards
compatibility and maximum "modernity", but
not really things in-between
