fixup! fixup! Add ws/robust, an alternative to ws_manager

add userFills support

Author: abrkn

src/ws/robust/subs.rs

@@ -48,6 +48,7 @@ fn get_topic_key_for_subscription(topic: &Topic) -> String {
     match topic {
         Subscription::UserEvents { user: _ } => "userEvents".to_string(),
         Subscription::OrderUpdates { user: _ } => "orderUpdates".to_string(),
+        Subscription::UserFills { user: _ } => "userFills".to_string(),
         _ => serde_json::to_string(topic).expect("Failed to convert subscription to string"),
     }
 }