CLN: Bring pandas up to date with pandas-datareader
Per: pydata/pandas-datareader#15

Fixes #9010, #9026 

thanks @dstephens99 

if there are any other corrections to bring these in sync. pls lmk asap.
 @jreback Just diff'ed the pandas-datareader data file with the one in pandas - they are the same, everything is up to date.
