language: ruby
rvm:
  - 2.3
  - 2.4
  - 2.5

notifications:
  email:
    on_success: change

language: ruby
rvm:
  - 2.3
  - 2.4
  - 2.5

before_install:
  - gem update --system

notifications:
  email:
    on_success: change

Add command for updating system gems before Travis CI build
Add command for updating system gems before Travis CI build

Work-around for https://github.com/travis-ci/travis-ci/issues/8969#issuecomment-354135622
