Get the history of the submission

{
  "type": "array",
  "items": {
    "type": "object",
    "description": "History item of the submission",
    "properties": {
      "attachment": {
        "type": "object",
        "properties": {
          "revision": {
            "type": "string",
            "description": "The revision identifier that changed"
          },
          "score": {
            "type": "string",
            "description": "The score identifier that changed"
          }
        }
      },
      "date": {
        "type": "string",
        "format": "date-time",
        "description": "The date when the submission was changed"
      },
      "draftGrade": {
        "type": "number",
        "description": "The numerator of the grade at this time in the submission grade history"
      },
      "grade": {
        "type": "number",
        "description": "The numerator of the grade at this time in the submission grade history"
      },
      "maxPoints": {
        "type": "number",
        "description": "The denominator of the grade at this time in the submission grade history"
      },
      "state": {
        "type": "string",
        "description": "State of the submission",
        "enum": [
          "created",
          "turnedIn",
          "returned"
        ]
      },
      "users": {
        "type": "array",
        "description": "The user(s) unique identifier(s) who made the change",
        "items": {
          "type": "string"
        }
      }
    }
  }
}