additionalProperties and required not forwarded from $ref

[kevich]

Due to normalise of additionalProperties and required before making dereference(), seems the properties additionalProperties and required from $res do not properly passed into main schema.

Here's an example:
main_schema.json:

{
  "title": "MainSchema",
  "type": "object",
  "$ref": "reference.json"
}

reference.json:

{
  "title": "Reference",
  "type": "object",
  "properties": {
    "name": {
      "type": "string"
    }
  },
  "additionalProperties": false,
  "required": ["name"]
}

expected d.ts for main_schema.json would be:

export interface MainSchema {
  name: string;
}

but it will be:

export interface MainSchema {
  name?: string;
  [k: string]: any;
}

which is wrong...

[bcherny]

Unable to repro -- this is fixed.