+ optional:
+ ':development':
+ - gem: 'github_changelog_generator'
+ git: 'https://github.com/skywinder/github-changelog-generator'
+ ref: '20ee04ba1234e9e83eb2ffb5056e23d641c7a018'
+ condition: "Gem::Version.new(RUBY_VERSION.dup) >= Gem::Version.new('2.2.2')"
+ - gem: puppet-lint-i18n