ask - last price balance

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Its nice feature from freqtrade: 

Understand ask_last_balance

ask_last_balance sets the bidding price. Value 0.0 will use ask price, 1.0 will use the last price and values between those interpolate between ask and last price. Using ask price will guarantee quick success in bid, but bot will also end up paying more then would probably have been necessary.

I would be using this in gekko.