add comment regarding 'performance' of bot

src/logic/future_moves.rs

@@ -220,6 +220,10 @@ impl FutureMoves {
                     .map(|(i, &child)| self.arena[child].value * ((i + 1) as i128))
                     .sum::<i128>();
 
+                // previously we used `depth` and divided `self_value` by it, idk if this is worth it
+                // we should really setup some sort of ELO rating for each commit, playing them against
+                // each other or something, could be cool to benchmark these more subjective things, not
+                // just performance
                 self.arena[idx].value = self.arena[idx].self_value as i128 + children_value;
             }
         }