Update SharedSlotType.cs
Update SharedSlotType.cs

Hello,

It should have `id`. It can be extracted from `_links` somehow, but it would be nice to have the property.

```
{
  "slotTypes": [
    {
      "_links": {
        "self": {
          "href": "/v1/skills/api/custom/interactionModel/slotTypes/amzn1.ask.interactionModel.slotType.cedb3d3f-4410-4dd5-b8b3-1aa1e67f4fc4"
        }
      },
      "id": "amzn1.ask.interactionModel.slotType.cedb3d3f-4410-4dd5-b8b3-1aa1e67f4fc4",
      "name": "myslot"
    }
  ]
}
```
stoiveyp/Alexa.NET.Management