language: ruby
rvm:
  - 2.3
  ## https://travis-ci.org/AlexWayfer/flame/jobs/349907949
  ## https://bugs.ruby-lang.org/issues/13539
  - 2.4.3
  - 2.5

before_install:
  - gem update --system

cache: bundler

notifications:
  email:
    on_success: change

language: ruby
rvm:
  - 2.3
  ## https://travis-ci.org/AlexWayfer/flame/jobs/349907949
  ## https://bugs.ruby-lang.org/issues/13539
  - 2.4.3
  - 2.5

before_install:
  - gem update --system
  - gem install bundler

cache: bundler

notifications:
  email:
    on_success: change

Fix Travis CI builds with Ruby 2.5.1
Fix Travis CI builds with Ruby 2.5.1

Reference: https://github.com/travis-ci/travis-ci/issues/8978#issuecomment-377680126
