language: ruby
rvm:
  - 2.1.10
  - 2.2.5
  - 2.3.1
gemfile:
  - gemfiles/rails_4.gemfile
  - gemfiles/rails_5.gemfile
matrix:
  exclude:
    rvm: 2.1.10
    gemfile: gemfiles/rails_5.gemfile

language: ruby
rvm:
  - 2.2.6
  - 2.3.3
  - 2.4.0
gemfile:
  - gemfiles/rails_4.gemfile
  - gemfiles/rails_5.gemfile

Update ruby versions tested on TravisCI
Update ruby versions tested on TravisCI
