update notification styles

MediaBrowser.Model/ApiClient/IApiClient.cs

@@ -212,6 +212,13 @@ namespace MediaBrowser.Model.ApiClient
         /// <exception cref="ArgumentNullException">userId</exception>
         Task<BaseItemDto> GetRootFolderAsync(string userId);
 
+        /// <summary>
+        /// Gets the additional parts.
+        /// </summary>
+        /// <param name="itemId">The item identifier.</param>
+        /// <returns>Task{BaseItemDto[]}.</returns>
+        Task<BaseItemDto[]> GetAdditionalParts(string itemId);
+        
         /// <summary>
         /// Gets the users async.
         /// </summary>