message: update travis with greenkeeper-lockfile
diff: @@ -3,5 +3,12 @@ language: node_js
  node_js: stable
  before_install:
  + - yarn global add greenkeeper-lockfile@1
  - npm config set spin false --global
  - node resources/hoistDependencies.js
  +
  +before_script:
  + - greenkeeper-lockfile-update
  +
  +after_script:
  + - greenkeeper-lockfile-upload
  