Ability to setup RequestCode value

I start using your library and you had worked pretty good! Very convenient builder with "speaking" options names!
I did not find an opportunity for setup `requestCode` value when I launch Activity.
For example I propose to create a few overload methods in the builder class in `CropImage.ActivityBuilder`:
`start(Activity activity, int requestCode)`
`start(Activity activity, Fragment fragment, int requestCode)`
etc
What do you think about my proposal?
I can implement if you agree with this solution.