Fixes issue #447 (Notification Icon for Join)

src/NzbDrone.Core/Notifications/Join/JoinProxy.cs

@@ -87,7 +87,7 @@ namespace NzbDrone.Core.Notifications.Join
             request.AddParameter("apikey", settings.ApiKey);
             request.AddParameter("title", title);
             request.AddParameter("text", message);
-            request.AddParameter("icon", "https://cdn.rawgit.com/Sonarr/Sonarr/develop/Logo/256.png"); // Use the Sonarr logo.
+            request.AddParameter("icon", "https://cdn.rawgit.com/Radarr/Radarr/develop/Logo/256.png"); // Use the Sonarr logo.
 
             var response = client.ExecuteAndValidate(request);
             var res = Json.Deserialize<JoinResponseModel>(response.Content);