docs: function syncItem ( pinboard, item ) {
  	return pify(pinboard.add.bind(pinboard))(item)
  		.then(( res ) => {
  			if ( typeof res === 'undefined' ) {
  				return Promise.reject('Unknown error occured while syncing with Pinboard.');
  			}
  			if ( res.result_code !== 'done' ) {
  				return Promise.reject(`Error while syncing with Pinboard: ${res.result_code}`);
  			}
  			return {
  				url: item.url,
  				pinboardResponse: res
  			};
  		});
  }