code: function(skill_id, vehicle_type, fields) {
  		return request({
  			hostname: hosts.wotb,
  			path: '/wotb/encyclopedia/crewskills/'
  		}, {
  			skill_id: skill_id ? skill_id.toString() : '',
  			vehicle_type: vehicle_type ? vehicle_type.toString() : '',
  			fields: fields ? fields.toString() : ''
  		});
  	}
docs: Description of crew skills.
  
  @params {string|string[]} [skill_id] name of skill(s) to request
  @params {string|string[]} [vehicle_type] select skill category
  @params {string|string[]} [fields] response selection
  @returns {Promise<Object>} resolves to the description