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Fix code on Markowitz optimization

This code is from Lecture 8 in the folder "Tutorial and Documentation" in Notebook. There is one error if you run it:

"ImportError: cannot import name add_history".

add_history is not used in zipline anymore by google search. If I remove add_history from import list, then it shows up with another error:

"RemoteDataError: Unable to read URL:"

I do not know how to fix it. Anybody can help?

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