language: ruby
rvm:
  - 2.0.0
  - 2.1.10
  - 2.2.10
  - 2.3.8
  - 2.4.6
  - 2.5.5
  - 2.6.2
script: bundle exec rspec
before_install:
  # fixes Travis CI error: NoMethodError: undefined method `spec' for nil:NilClass
  - gem install bundler --version 1.17.3
gemfile:
  - gemfiles/rack-1.3.gemfile
  - gemfiles/rack-2.0.gemfile
matrix:
  exclude:
    - rvm: 2.0.0
      gemfile: gemfiles/rack-2.0.gemfile
    - rvm: 2.1.8
      gemfile: gemfiles/rack-2.0.gemfile

language: ruby
rvm:
  - 2.0.0
  - 2.1.10
  - 2.2.10
  - 2.3.8
  - 2.4.6
  - 2.5.5
  - 2.6.2
script: bundle exec rspec
before_install:
  # fixes Travis CI error: NoMethodError: undefined method `spec' for nil:NilClass
  - gem install bundler --version 1.17.3
gemfile:
  - gemfiles/rack-1.3.gemfile
  - gemfiles/rack-2.0.gemfile
matrix:
  exclude:
    - rvm: 2.0.0
      gemfile: gemfiles/rack-2.0.gemfile
    - rvm: 2.1.10
      gemfile: gemfiles/rack-2.0.gemfile

Fix Rack dependency issue in Travis
Fix Rack dependency issue in Travis
