cache: bundler

rvm:
  - 2.0
  - 2.1
  - 2.2

script: bundle exec rake

notifications:
  email: false

sudo: false

git:
  depth: 10

cache: bundler

rvm:
  - 2.0
  - 2.1
  - 2.2
  - 2.3.0-preview2

script: bundle exec rake

notifications:
  email: false

sudo: false

git:
  depth: 10

Add 2.3 to list of tested Rubies
Add 2.3 to list of tested Rubies

Start testing `json_schema` under 2.3 (currently under preview, but
expected to be released fairly soon).
