Update reverse-linked-list-iterative.py

Author: ivanmmarkovic

recursion/reverse-linked-list-iterative.py

@@ -4,7 +4,7 @@ def __init__(self, val=0, next=None):
         self.next = next
 
 
-def reverse_list(self, head: ListNode) -> ListNode:
+def reverse_list(head: ListNode) -> ListNode:
     if head is None or head.next is None:
         return head