Fix subscription

Signed-off-by: Joe Grund <[email protected]>

Author: jgrund

juniper_axum/src/subscriptions.rs

@@ -618,7 +618,7 @@ where
     let output = s_rx
         .map(|msg| {
             Ok(serde_json::to_string(&msg)
-                .map(ws::Message::Text)
+                .map(|x| ws::Message::Text(x.into()))
                 .unwrap_or_else(|e| {
                     ws::Message::Close(Some(ws::CloseFrame {
                         code: 1011, // CloseCode::Error