(2020-07-15)
* New Order/Trade/Position API (47)
* Add data pandas accessors [`.df` and `.s`](https://kernc.github.io/backtesting.py/doc/backtesting/backtesting.html#backtesting.backtesting.Strategy.data)
* Add `Backtest(..., exclusive_orders=)` that closes previous trades on new orders
* Add `Backtest(..., hedging=)` that makes FIFO trade closing optional
* Add `bt.plot(reverse_indicators=)` param
* Add `bt.plot(resample=)` and auto-downsample large data
* Use geometric mean return in Sharpe/Sortino stats computation