Create tileset source throws error in v0.16

I tried upgrading the library from v0.13.4 to v0.16.0

When calling this code to create a tileset source in v0.13.4 it works, but in v0.16.0 it throws an error:

```
const tileSourceResponse = await this.tilesets.createTilesetSource({
    id: sourceId,
    file: `./${id}.ldgeojson`
}).send();
```

Error is:
`No file data in request. Expected 1 file named \"file\".`

