In this task, you are given a list of unique integers you need to swap the positions of maximum and minimum element in the list and return the updated list.

[10, 480, 227, 122, 103, 371, 175, 131, 151, 260, 125, 449, 394, 198, 255, 178, 417, 149, 140, 256]
[480, 10, 227, 122, 103, 371, 175, 131, 151, 260, 125, 449, 394, 198, 255, 178, 417, 149, 140, 256]