Income tax on gratuity paid before 29- march-2018

Dear Sir,

I was a PSU employee and retired in December-2017. I have been paid Rs. 2000000/-  at the time of my superannuation. Tax on Rs. 1000000/- has also been deducted at source. Now the Gratuity Amendment Bill has been notified on 29-March-2018. The question is whether I am entitled for exemption of Tax on Rs. 1000000/- of gratuity amount or not? Please help me. 

Thanks

SK Verma