Merge pull request #179 from SidKZ0/patch-1

Update btreemarketdepth.rs

Author: nkaz001

hftbacktest/src/depth/btreemarketdepth.rs

@@ -95,7 +95,7 @@ impl L2MarketDepth for BTreeMarketDepth {
         timestamp: i64,
     ) -> (i64, i64, i64, f64, f64, i64) {
         let price_tick = (price / self.tick_size).round() as i64;
-        let prev_best_ask_tick = *self.bid_depth.keys().next().unwrap_or(&INVALID_MAX);
+        let prev_best_ask_tick = *self.ask_depth.keys().next().unwrap_or(&INVALID_MAX);
         let prev_qty = *self.ask_depth.get(&prev_best_ask_tick).unwrap_or(&0.0);
 
         if (qty / self.lot_size).round() as i64 == 0 {