language: ruby
before_install:
  - gem install bundler || gem install bundler -v 1.17.3 # the default bundler version on travis is very old and causes 1.9.3 build issues
rvm:
  - 1.9.3
  - jruby-1.7.27
  - 2.0.0
  - 2.1.10
  - 2.2.10
  - 2.3.8
  - 2.4.5
  - 2.5.3
  - 2.6.0
  - jruby-9.2.5.0
  - rbx-3

language: ruby
before_install:
  - gem install bundler || gem install bundler -v 1.17.3 # the default bundler version on travis is very old and causes 1.9.3 build issues
rvm:
  - 1.9.3
  - 2.0.0
  - 2.1.10
  - 2.2.10
  - 2.3.8
  - 2.4.5
  - 2.5.3
  - 2.6.0
  - jruby-9.2.5.0

Remove JRuby 1.7 and Rubinius from the test matrix
Remove JRuby 1.7 and Rubinius from the test matrix

Since Travis made Xenial the default build environment, JRuby 1.7 no
longer runs, and Rubinius can't even be installed:

https://travis-ci.org/cypriss/mutations/jobs/589829405
https://travis-ci.org/cypriss/mutations/jobs/589829414

Given that these implementations are rarely used, I'm removing them from
the test matrix to get the build green again.
