quickfix: report usage of ellipsis usage when appending a short list to a slice

[ccoVeille]

Please consider the following code

slice := []int{1, 2, 3}

// Appending slices
slice := append(slice, []int{4, 5, 6}...)

I would expect to report that this would be simpler

slice := []int{1, 2, 3}

// Appending to a slice
slice := append(slice, 4, 5, 6)

I noticed here today, but I already faced in my own code

xhd2015/xgo#163 (comment)

[ccoVeille]

Some other examples can be found via GitHub

https://github.com/search?q=lang%3Ago+append+%22...%22+%22%5B%5Dstring%22&type=code

Here is one, the file is using this pattern

https://github.com/johnmanjiro13/gh-bump/blob/fe3931d1142abe7632a50905a9f808579b250d20/gh.go#L45