gate 账户，持仓，ticker 的rest

exchanges/tests/test.rs

@@ -1,9 +1,4 @@
 use std::collections::BTreeMap;
-use std::io;
-use exchanges::binance_usdt_swap_ws;
-use exchanges::binance_usdt_swap_ws::BinanceUsdtSwapWs;
-use exchanges::response_base::ResponseData;
-use std::io::{Read, Write};
 use exchanges::gate_swap_rest::GateUsdtSwapRest;
 
 #[tokio::test]