AttributeError: 'NoneType' object has no attribute 'state'

[CreamyLong]

Hi, Thanks for your great work. When I run your example NaughtsAndCrossesState, I get the info that is AttributeError: 'NoneType' object has no attribute 'state'

[CreamyLong]

I found that when I set timeLimit or iterationLimit low the program was ok, but when the values are high the error comes out

[WhymustIhaveaname]

This is because he uses the same name for class mcts and the object mcts.

mcts = mcts(timeLimit=1000)
bestAction = mcts.search(initialState=initialState)

Change it into

searcher = mcts(timeLimit=1000)
action = searcher.search(initialState=initialState)

will solve this issue. I also correct this in pull request #13.