language: ruby
rvm:
  - 2.0.0
  - 2.1.7
  - 2.2.3
  - 2.3.0
before_install: gem install bundler -v 1.10.6

language: ruby
rvm:
  - 2.0.0
  - 2.1.7
  - 2.2.3
  - 2.3.0
before_install: gem install bundler -v 1.11.2

Upgrade Bundler version on TravisCI
Upgrade Bundler version on TravisCI
