Added limitations and known bugs to the README
Added limitations and known bugs to the README

kevinmel2000/excel_to_code,tamc/excel_to_code,jmptrader/excel_to_code,jmptrader/excel_to_code,kevinmel2000/excel_to_code,dberlin/excel_to_code,dberlin/excel_to_code,tamc/excel_to_code,tamc/excel_to_code,tamc/excel_to_code