New feature: Number between?

[nickcoad]

I think it would be super useful to choose bounds for the random numbers. Any likelihood of this being added? Happy to take a look at doing it myself in a PR if you think it's worthwhile?

My thinking is:

Faker:Random => Number => Min Number => Max Number

In the min number and max number fields, probably default to the values that are currently being used as min and max already.