nullable-simple-commit(Simple Commit)

{
    "id": "7638417db6d59f3c431d3e1f261cc637155684cd",
    "tree_id": "string",
    "message": "Fix #42",
    "timestamp": "2014-08-09T08:02:04+12:00",
    "author": {
        "name": "Monalisa Octocat",
        "email": "monalisa.octocat@example.com"
    },
    "committer": {
        "name": "Monalisa Octocat",
        "email": "monalisa.octocat@example.com"
    }
}