de_de breaks the determinism tests

[xoryouyou]

First of all sorry for the inconvenience.

The determinism tests fail, due to the newly introduced ADDRESS_CITY_GEN_FN which uses a separate rand::thread_rng().
The test originally seeds the rng and provides fake with two identical instances here

tests/determinism.rs#L10

I have no idea on top of my hat, but the footpring of ADDRESS_CITY_GEN_FN needs to be changed from Option<fn()->String> to somehow include the original thread_rng().

[cksac]

it is ok, I have introduced CityNameGenFn,

fake-rs/fake/src/faker/impls/address.rs

Line 35 in 3dd2676

pub trait CityNameGenFn: Data + Sized + Copy {

the current test fail is fixed

[xoryouyou]

Ohh I have just pulled master and seen your changes.
Awesome then nevermind the issue, I'll close it.