Remove deprecated methods in tests

tests/test.rs

@@ -599,7 +599,7 @@ fn test_notifications_next_block() {
 
     let _t = thread::spawn(|| {
         let conn = or_panic!(Connection::connect("postgres://postgres@localhost", SslMode::None));
-        thread::sleep_ms(500);
+        thread::sleep(Duration::from_millis(500));
         or_panic!(conn.execute("NOTIFY test_notifications_next_block, 'foo'", &[]));
     });
 
@@ -618,9 +618,9 @@ fn test_notification_next_timeout() {
 
     let _t = thread::spawn(|| {
         let conn = or_panic!(Connection::connect("postgres://postgres@localhost", SslMode::None));
-        thread::sleep_ms(500);
+        thread::sleep(Duration::from_millis(500));
         or_panic!(conn.execute("NOTIFY test_notifications_next_timeout, 'foo'", &[]));
-        thread::sleep_ms(1500);
+        thread::sleep(Duration::from_millis(1500));
         or_panic!(conn.execute("NOTIFY test_notifications_next_timeout, 'foo'", &[]));
     });
 
@@ -642,7 +642,7 @@ fn test_cancel_query() {
     let cancel_data = conn.cancel_data();
 
     let _t = thread::spawn(move || {
-        thread::sleep_ms(500);
+        thread::sleep(Duration::from_millis(500));
         assert!(postgres::cancel_query("postgres://postgres@localhost", SslMode::None,
                                        cancel_data).is_ok());
     });