Update README.md

Corrected the expected output of the JSON from the API

README.md

@@ -121,14 +121,14 @@ Save and enable the list. Lidarr will poll the URL on its schedule and import ne
 ## 🔌 API Endpoints
 
 - `GET /artists`  
-  - Returns a JSON array of MusicBrainz Artist IDs optimized for Lidarr custom import:
+  - Returns a JSON array of dictionaries, each containing a `foreignId` field with a MusicBrainz Artist ID.  
     ```json
     [
-      "b10bbbfc-cf9e-42e0-be17-e2c3e1d2600d",
-      "some-other-mbid-..."
+      {"foreignId": "0b987f3c-7264-439a-a1b9-62a69c9b1d91"},
+      {"foreignId": "0ebdc5f5-0a11-415a-b6f3-efe0d36c6e9d"}
     ]
     ```
-  - (Lidarr expects a simple array of MBIDs.)
+  - Lidarr expects objects with a `foreignId` key pointing to the MBID.
 
 - `GET /health` (optional)  
   - Returns basic service health/status (if implemented) — check for `200 OK`.