Update this project api to 2.5

[sahilupadhye]

Hi Souvik,

I have tried your wonderful project but it is developed for API spec 1.6 and since then there has some changes from UIDAI. Also the 1.6 staging API are now shutdown.

I tried modifying the source but I ended up getting 502 error ie Invalid PID encryption.

Could you please help with your expertise and upgrade the project to the latest API specification.