Implement funk.Remove from a slice by index

[tom10271]

[Flo]

You can do it with a pure typesafe implementation:

func RemoveInt(slice []int, s int) []int {
    return append(slice[:s], slice[s+1:]...)
}

[Dimmy Junior]

But I think its god ideia. Add to funk. If you wanna. I can do and open PR.