get_data_yahoo returns NaN record for future date for TGT

[leschrh69]

getting the price candle for Target today, 8/17/20, albeit 10pm Pacific via:

pdr.get_data_yahoo('TGT',interval='1d',start='2020-08-15')

will result in:

	Open	High	Low	Close	Adj Close	Volume
Date
2020-08-17	137.979996	138.690002	137.399994	138.240005	137.559998	4616400
2020-08-17	137.979996	138.690002	137.399994	138.240005	137.559998	4441207
2020-08-18	NaN	NaN	NaN	NaN	NaN	NaN

which is somewhat undesired, since 8/18 hasn't happened yet, and the same doesn't happen with another ticker like 'KSS' or 'M', i.e. the result ends with 8/17.