Passing unit tests

:smile:
This should definitely warn. And the body should be { ... }.

See the current behavior: 

Input:

```
# GET /1
+ Response 200

{ ... }
```

Output:

```json
OK.
warning: (10)  dangling message-body asset, expected a pre-formatted code block, indent every of its line by 8 spaces or 2 tabs :25:7

{
  "_version": "2.0",
  "metadata": [],
  "name": "",
  "description": "",
  "resourceGroups": [
    {
      "name": "",
      "description": "",
      "resources": [
        {
          "name": "",
          "description": "",
          "uriTemplate": "/1",
          "model": {},
          "parameters": [],
          "actions": [
            {
              "name": "",
              "description": "",
              "method": "GET",
              "parameters": [],
              "examples": [
                {
                  "name": "",
                  "description": "",
                  "requests": [],
                  "responses": [
                    {
                      "name": "200",
                      "description": "",
                      "headers": [],
                      "body": "{ ... }",
                      "schema": ""
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}

```