Update task.md

Please check it carefully. The provided solution or the task probably isn't correct.

You have two ways:
1. Correct solution (bad way IMO):
function unique(arr: Array<string>) {
  return Array.from(new Set(arr)).join(', ');
}

2. Correct task (see PR).

Author: notacircle

1-js/05-data-types/07-map-set/01-array-unique-map/task.md

@@ -19,7 +19,7 @@ let values = ["Hare", "Krishna", "Hare", "Krishna",
   "Krishna", "Krishna", "Hare", "Hare", ":-O"
 ];
 
-alert( unique(values) ); // Hare, Krishna, :-O
+alert( unique(values) ); // Hare,Krishna,:-O
 ```
 
 P.S. Здесь мы используем строки, но значения могут быть любого типа.