Use multiple assignment instead of a temp variable (#300)

Co-authored-by: Andrii Siriak <[email protected]>

Author: Ikhan

sorts/selectionsort.go

@@ -11,9 +11,7 @@ func SelectionSort(arr []int) []int {
 			}
 		}
 
-		tmp := arr[i]
-		arr[i] = arr[min]
-		arr[min] = tmp
+		arr[i], arr[min] = arr[min], arr[i]
 	}
 	return arr
 }