Add a newline to cron job
Add a newline to cron job

Otherwise it will fail with this error:
`Feb 15 09:58:01 ci-agent-4.ci cron[1197]: (*system*run_puppet_on_boot) ERROR (Missing newline before EOF, this crontab file will be ignored)`

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet