code: function(clan_id, extra, fields) {
  		if (!clan_id) return Promise.reject(new Error('wotblitz.clans.info: clan_id is required'));
  
  		return request({
  			hostname: hosts.wotb,
  			path: '/wotb/clans/info/'
  		}, {
  			clan_id: clan_id.toString(),
  			extra: extra ? extra.toString() : '',
  			fields: fields ? fields.toString() : ''
  		});
  	}
docs: Clan(s) details.
  
  @param {number|number[]} clan_id id(s) of the clans to return
  @param {string|string[]} [extra] additional fields to request, value "members"
  @param {string|string[]} [fields] response selection
  @returns {Promise<Object>} resolves to description of the clan(s)