The append built-in function appends elements to the end of a slice. If
it has sufficient capacity, the destination is resliced to accommodate the
new elements. If it does not, a new underlying array will be allocated.
Append returns the updated slice. It is therefore necessary to store the
result of append, often in the variable holding the slice itself:

	slice = append(slice, elem1, elem2)
	slice = append(slice, anotherSlice...)

As a special case, it is legal to append a string to a byte slice, like this:

	slice = append([]byte("hello "), "world"...)