TrailingStopLoss

Library "TrailingStopLoss"
简易追踪止损； 未充分测试，欢迎提交issue

drawdown_percent(entry_bar_index, direction_long)
  drawdown_percent: 回撤百分比
  Parameters:
    entry_bar_index (int)
    direction_long (bool)
  Returns: percentage: 回撤百分比 > 0

closure_needed(entry_bar_index, initial_sl_price, percentage_ts, num_bars_tolerance, extra_drawdown_distance)
  closure_needed: 是否满足平仓条件
  Parameters:
    entry_bar_index (int)
    initial_sl_price (float)
    percentage_ts (float)
    num_bars_tolerance (int)
    extra_drawdown_distance (float)
  Returns: do_closure: bool 是否平仓