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.

[302, 130, 294, 366, 18, 311, 261, 263, 349, 160, 48, 323, 455, 177, 477, 384, 69, 377, 232, 107]
[302, 130, 294, 366, 477, 311, 261, 263, 349, 160, 48, 323, 455, 177, 18, 384, 69, 377, 232, 107]