make more fields optional

src/raw/response.rs

@@ -216,8 +216,8 @@ pub struct UserPlayingNowPayload {
 #[derive(Debug, Deserialize)]
 pub struct UserPlayingNowListen {
     pub user_name: Option<String>,
-    pub inserted_at: String,
-    pub recording_msid: String,
+    pub inserted_at: Option<String>,
+    pub recording_msid: Option<String>,
     pub track_metadata: UserPlayingNowTrackMetadata,
 }