AspNetCore.Docs/aspnetcore/whats-new/toc.yml

- name: What's new
  href: index.yml
  expanded: true
  items:
    - name: 2019
      expanded: true
      items:
      - name: December
        href: 2019-12.md
      - name: November
        href: 2019-11.md
      - name: October
        href: 2019-10.md
      - name: September
        href: 2019-09.md