add total of stars to README

2024/gleam/src/aoc/day_two.gleam

@@ -25,7 +25,7 @@ pub fn main() {
 fn is_safe(report: Report) -> Bool {
   let diffs =
     report
-    |> list.zip(with: list.drop(report, 1))
+    |> list.window_by_2()
     |> list.map(fn(p) { pair.first(p) - pair.second(p) })
 
   list.all(diffs, fn(n) { 1 <= n && n <= 3 })