message: Attempt to fix npm install for Node 4.
diff: @@ -12,6 +12,7 @@ sudo: false
  # Update package-lock.json after test runs:
  before_install:
  - - npm install -g npm@latest greenkeeper-lockfile@1
  + - npm install -g npm
  + - npm install -g greenkeeper-lockfile@1
  before_script: greenkeeper-lockfile-update
  after_script: greenkeeper-lockfile-upload
  