code: function Listings (options) {
      options = options || {};
  
      EventEmitter.call(this);
  
      this.accessToken = options.accessToken;
      this.steamid64 = options.steamid64;
  
      this.waitTime = options.waitTime || 1000;
  
      this.cap = -1;
      this.promotes = -1;
      this.listings = [];
  
      this.actions = {
          create: [],
          remove: []
      };
  
      this.items = options.items || new Items({ apiKey: options.apiKey });
  
      this.ready = false;
  }
docs: Creates a new instance of bptf-listings
  @class
  @param {object} options Optional settings