Add aggregateByTime to the user_fills_by_time method in Info?

[olzhang]

Per the documentation, the endpoint to retrieve a user's fill by time takes a aggregateByTime parameter in the request body. Can we add that as an argument to the user_fills_by_time method in the Info class?

[traderben]

Sure, feel free to make a PR

[olzhang]

yep see above

[olzhang]

Thanks! sorry for the many linter fixes