WordPress Cluster 9.9.9

• Plugins updated:

  • Syndicate version 1.3.7
    • Enable the content in the Yoast seo ‘slug’ field to pass from Syndicate to the child news sites

• Misc updated:

  • Readme.md
  • added command to help others in case not known

PR: #4333, https://github.com/dc-thomson/wordpress/pull/4419