Update stock_time_series.jl

[snovum]

According to the Alpha Vantage Documentation time_series_intraday_extended queries have now been folded into time_series_intraday queries via an added optional month parameter. I tried to incorporate the optional parameters month, extended_hours, and adjusted by making the following changes. 1) Adding the above parameters to the time_series_intraday function and defaulting the boolean parameters extended_hours and adjusted to true as per the API documentation. 2) Adding an argcheck for the non boolean month parameter to ensure that months are entered in the required (YYYY-MM) format starting from 2000-01 which is when data is first available. 3) Adding the new parameters to the paramsdictionary. No other alterations were made to the time_series_intraday function. I removed the time_series_intraday_extended function as it appears to have been deprecated. It no longer appears in the Alpha Vantage API documentation and did not appear to work when I tested it. Thanks for reviewing the matter.