解决警告

standard/src/phemex_swap.rs

@@ -10,7 +10,7 @@ use rust_decimal_macros::dec;
 use serde_json::{json, Value};
 use tokio::spawn;
 use tokio::time::Instant;
-use tracing::{error, info, trace, warn};
+use tracing::{error, info, trace};
 use exchanges::phemex_swap_rest::PhemexSwapRest;
 use crate::{Platform, ExchangeEnum, Account, Position, Ticker, Market, Order, OrderCommand, PositionModeEnum, utils};
 use global::trace_stack::TraceStack;