How to make "negative" fuzzers?

Hi,

I'm trying to migrate a library on Elm 0.19.0 and my tests were relying on `Fuzz.conditional` to tests cases where an input was "anything but" specific values (ie: I want any integer that is not a multiple of 3 ; I want any string that does not contain some substrings).

I used to do it like this:

```Elm
Fuzz.conditional
{ retries = 10
, fallback = always 1
, condition = \n -> (n |> modBy 3) == 0
}
int
```

Can I do this now? If so, how can I do this now? If not, am I the only one to use that kind of strategy? If so, how do you use fuzzy testing to test those kinds of cases?