gistfile1.json

{
  "title": "Immigration Rules Updates",
  "slug": "guidance/immigration-rules/updates",
  "kind": "manual-change-notes",
  "details": {
    "manual_slug": "guidance/immigration-rules",
    "updates": [
      {
        "published_at": "2014-04-01T12:30:00",
        "slug": "guidance/immigration-rules/document-slug",
        "title": "document title",
        "change_note": "LOL first change"
      },
      {
        "published_at": "2014-04-01T14:30:00",
        "slug": "guidance/immigration-rules/document-slug",
        "title": "document title",
        "change_note": "ROFLMAO second change"
      },
      {
        "published_at": "2014-04-01T15:45:00",
        "slug": "guidance/immigration-rules/other-document-slug",
        "title": "document title",
        "change_note": "A rad change"
      },
      {
        "published_at": "2014-05-01T00:30:00",
        ...
      }
    ]
  }
}

I think we should change "updated_at" to "published_at" and "change_notes" to "change_note"