"TypeError: __init__() got an unexpected keyword argument 'engine' " with ExcelWriter
Code :
`writer = pd.ExcelWriter('pandas_simple.xlsx', engine='xlsxwriter', constant_memory=True)`


The error I get is 

> "TypeError: __init__() got an unexpected keyword argument 'engine' "

I have imported pandas as pd & xlsxwriter


to_excel works , using workbook with xlsxwriter and using its writer also works ,
but somehow the Pandas "ExcelWriter" doesn't recognize "engine"
