language: ruby
rvm:
  - 2.2.9
  - 2.3.6
  - 2.4.3
  - 2.5.0
  - ruby-head

language: ruby
rvm:
  - 2.2.9
  - 2.3.6
  - 2.4.3
  - 2.5.0
  - ruby-head
before_script:
  # https://github.com/travis-ci/travis-ci/issues/8978
  - gem update --system

Fix load error in Ruby 2.5.0
Fix load error in Ruby 2.5.0

Prevents errors like the following from being returned:

    bundler: failed to load command: rake (/home/travis/.rvm/rubies/ruby-2.5.0/bin/rake)
    LoadError: cannot load such file -- bundler/dep_proxy
