notifications:
  email: false

rvm:
  - 2.1.2
  - 2.2.4
  - 2.3.1

notifications:
  email: false

rvm:
  - 2.1.2
  - 2.2.4
  - 2.3.1

before_install:
  - gem install bundler # the default version of bundler for ruby 2.1 is out of date.

Update bundler before running the build.
Update bundler before running the build.