Fix code style

src/lib.rs

@@ -388,7 +388,9 @@ where
     }
 
     fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
-        (*self).with_context(Some((ContextWaker::Write, cx)), |s| cvt(s.flush())).map(|r| {
+        (*self)
+            .with_context(Some((ContextWaker::Write, cx)), |s| cvt(s.flush()))
+            .map(|r| {
                 // WebSocket connection has just been closed. Flushing completed, not an error.
                 match r {
                     Err(WsError::ConnectionClosed) => Ok(()),