[handler] make lint happy
@@ -7,7 +7,7 @@ use log::{debug, error};
use msql_srv::*;
use std::sync::{Arc, Mutex};
use std::time::Instant;
-use std::{io, net, thread};
+use std::{io, net};
use tokio::stream::StreamExt;
use threadpool::ThreadPool;
