language: ruby
rvm:
  - 2.1
  - ruby-head
  - jruby-19mode
  - rbx-2
  - 2.2.3
  - 2.3.1
matrix:
  allow_failures:
    - rvm: ruby-head
bundler_args: --without local_development
before_install: gem install bundler

language: ruby
rvm:
  - 2.1
  - ruby-head
  - jruby-19mode
  - rbx-2
  - 2.2.10
  - 2.3.8
  - 2.4.6
  - 2.5.5
  - 2.6.2
matrix:
  allow_failures:
    - rvm: ruby-head
bundler_args: --without local_development
before_install: gem install bundler -v 1.17.3

Test gem on recent ruby versions
Test gem on recent ruby versions

Use bundler 1.17.3