Minimum or fixed integer length

[jonagoldman]

I need some level of control over the generated integer length.
I don't know if this is even possible as I don't see any updates on #15.
If a fixed length is not possible, maybe a minimum length can be easier to implement?

[courtney-miles]

PR #36 introduces flexibility around this.

Note that from what I could see, the maths for generating the integers requires a binary numbers. This means you could restrict the numbers to 65535 but not 99999.