消除警告

strategy/src/phemex_usdt_swap.rs

@@ -1,5 +1,5 @@
 use std::cmp::Ordering;
-use tracing::{error, info};
+use tracing::{error};
 use std::collections::BTreeMap;
 use std::sync::Arc;
 use std::sync::atomic::AtomicBool;