fix linelint

Author: i-mprovising

clone-graph/i-mprovising.py

@@ -40,4 +40,4 @@ def bfs(self, node):
                     clones[nei] = Node(nei.val) # clone node
                     queue.append(nei) # append queue neighbor reference node
                 clones[node].neighbors.append(clones[nei]) 
-        return clone
+        return clone