language: ruby
rvm:
  - 2.2.3
before_install: gem install bundler -v 1.10.6

language: ruby
rvm:
  - 2.1.6
  - 2.2.3
before_install: gem install bundler -v 1.10.6

Add ruby version in 2.1 series.
Add ruby version in 2.1 series.
