language: ruby

rvm:
  # - 2.3
  - 2.4
  - 2.5
  - 2.6
  - 2.7
  - ruby-head

env:
  - COVERAGE=1

cache:
  - bundler

matrix:
  allow_failures:
    - rvm: ruby-head

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