day 15 code is re-updated

Author: darkprinx

Status/Day_15.md

@@ -205,6 +205,6 @@ n = int(input())
 sum = 0
 for i in range(1, n+1):
  sum+= i/(i+1)
-print(sum)
+print(round(sum, 2)) # rounded to 2 decimal point
 ```
 ---------------------