Remove incorrect id and model properties from CreateEditResponse

The `id` and `model` properties are not returned by the `POST` `/edits` endpoint.

Example JSON response from the `/edits` endpoint:

```
{
  "object": "edit",
  "created": 1675740853,
  "choices": [
    {
      "text": "Write a tagline for an ice cream shop. sweetest place.\n",
      "index": 0
    }
  ],
  "usage": {
    "prompt_tokens": 27,
    "completion_tokens": 35,
    "total_tokens": 62
  }
}
```

Reported in #7

Author: thejamescollins

openapi.yaml

@@ -2137,14 +2137,10 @@ components:
     CreateEditResponse:
       type: object
       properties:
-        id:
-          type: string
         object:
           type: string
         created:
           type: integer
-        model:
-          type: string
         choices:
           type: array
           items:
@@ -2190,10 +2186,8 @@ components:
             - completion_tokens
             - total_tokens
       required: 
-        - id
         - object
         - created
-        - model
         - choices
         - usage