WPCS 3.0.0 was recently released. We should update WP-CLI to use it!

https://github.com/WordPress/WordPress-Coding-Standards/wiki/Upgrade-Guide-to-WordPressCS-3.0.0-for-Developers-of-external-standards

• wp-cli/automated-tests
• wp-cli/admin-command
• wp-cli/cache-command
• wp-cli/checksum-command
• wp-cli/config-command
• wp-cli/core-command
• wp-cli/cron-command
• wp-cli/db-command
• wp-cli/dist-archive-command
• wp-cli/doctor-command
• wp-cli/embed-command
• wp-cli/entity-command
• wp-cli/eval-command
• wp-cli/export-command
• wp-cli/extension-command
• wp-cli/find-command
• wp-cli/i18n-command
• wp-cli/import-command
• wp-cli/language-command
• wp-cli/maintenance-mode-command
• wp-cli/media-command
• wp-cli/package-command
• wp-cli/php-cli-tools
• wp-cli/profile-command
• wp-cli/restful
• wp-cli/rewrite-command
• wp-cli/role-command
• wp-cli/scaffold-command
• wp-cli/scaffold-package-command
• wp-cli/search-replace-command
• wp-cli/server-command
• wp-cli/shell-command
• wp-cli/snapshot-command
• wp-cli/super-admin-command
• wp-cli/widget-command
• wp-cli/wp-cli
• wp-cli/wp-cli-bundle
• wp-cli/wp-cli-dev
• wp-cli/wp-cli-tests
• wp-cli/wp-cli.github.com
• wp-cli/wp-config-transformer
• wp-cli/wp-super-cache-cli

Done is:

• This repository is updated to WPCS 3.0.0.
• All of our repositories are updated to the latest version of this test package and passing.