Added OrNil functions

[v1def]

@achille-roussel Hello, sorry to disturb you. Maybe you didn't see this pull request?

[v1def]

Ease of use, there are cases where you are sure that your ksuid is correct. But you need to get from bytes or string, example below.

func getPosts(before, after []byte) {
    b, err := ksuid.FromBytes(before)
    if err != nil {
        panic(err)
    }

    a, err := ksuid.FromBytes(after)
    if err != nil {
        panic(err)
    }

    sortOptions := SortOptions{Before: b, After:  a}
}

Instead, you can do it like this:

func getPosts(before, after []byte) {
    sortOptions := SortOptions{
        Before: ksuid.FromBytesOrNil(before),
        After:  ksuid.FromBytesOrNil(after),
    }
}

KSUID already has something similar, ksuid.New(), only this function panics on error. OrNil functions are also used in many other packages (uuid, ulid).

[achille-roussel]

Thanks for sharing context!

Do you mind adding a section to the README with these examples to showcase how to use the new functions? Along with links to the other libraries you mentioned would be amazing as well!

[v1def]

Yes, thank you!