update required for https://github.com/lovesh/bulletproofs

[hansieodendaal]

Hi @lovesh, could you please update the main branch of your fork of https://github.com/lovesh/bulletproofs to the latest version of https://github.com/dalek-cryptography/bulletproofs?

I would like to create a PR with these changes afterwards: lovesh.zip, or you could just add them.

Thanks, Hansie.

[lovesh]

Hi @hansieodendaal. I will do them over this weekend.

[hansieodendaal]

Thanks @lovesh

[lovesh]

@hansieodendaal I have updated the bulletproof dependency branch. My branch smt has the dalek's branch develop merged.