SequenceUsing for all types

[zhiburt]

Generates sequence like in #70 for all types:

It seems to me, It'd be fine for many reasons such as testing and convenience.
I present some examples.

For Structure.

Cars{}.SequenceWith(3, func(i int) Car {
    return Car{Number: i}
})
// Cars{Car{0}, Car{1}, Car{2}}

For strings.

pie.Strings{}.SequenceWith(3, func(i int) string {
    prefix := "id_"
    return prefix + i
})
// pie.Strings{"id_0", "id_1", "id_2"}

It can be important to make a special sequence of numbers, and it could help.

pie.Ints{}.SequenceWith(3, func(i int) int {
    return i * 4
})
// pie.Ints{0, 4, 8}

[elliotchance]

This makes sense. I’d prefer the function to be called SequenceUsing, so it’s consistent with other function naming.