language: ruby
rvm:
  - 2.3
  - 2.4
  - 2.5

before_install:
  - gem update --system

notifications:
  email:
    on_success: change

language: ruby
rvm:
  - 2.3
  - 2.4
  - 2.5

before_install:
  - gem update --system

cache: bundler

notifications:
  email:
    on_success: change

Add Bundler caching for Travis CI
Add Bundler caching for Travis CI

More info [here](https://docs.travis-ci.com/user/caching/).
