message: Add maxmind prop to City model
diff: import mmdb = require('maxmind');
  +import { ICityResponse, IMaxMind } from './types';
  /** Class representing the model of a "City" response **/
  export class City {
  @@ -6,6 +7,7 @@ export class City {
  public readonly continent: mmdb.IContinent | undefined;
  public readonly country: mmdb.ICountry | undefined;
  public readonly location: mmdb.ILocation | undefined;
  + public readonly maxmind: IMaxMind | undefined;
  public readonly registered_country: mmdb.IBaseCountry | undefined;
  public readonly represented_country: mmdb.IRepresentedCountry | undefined;
  public readonly subdivisions: mmdb.ISubdivisions[] | undefined;
  @@ -16,11 +18,12 @@ export class City {
  *
  * @param fields The GeoIP2 response
  */
  - public constructor(fields: mmdb.ICityResponse) {
  + public constructor(fields: ICityResponse) {
  this.city = fields.city;
  this.continent = fields.continent;
  this.country = fields.country;
  this.location = fields.location;
  + this.maxmind = fields.maxmind;
  this.registered_country = fields.registered_country;
  this.represented_country = fields.represented_country;
  this.subdivisions = fields.subdivisions;
  