No get_batch_stock_quotes ?

There is not function 'get_batch_stock_quotes' in the TimeSeries:
 
When I call `data, meta_data = ts.get_batch_stock_quotes(symbols=('MSFT', 'FB', 'AAPL'))`

I receive the error message: `'TimeSeries' object has no attribute 'get_batch_stock_quotes'`

