Fixed: (RuTracker) Add new indexer url

Fixes #1610

src/NzbDrone.Core/Indexers/Definitions/RuTracker.cs

@@ -27,7 +27,8 @@ namespace NzbDrone.Core.Indexers.Definitions
         public override string[] IndexerUrls => new[]
         {
             "https://rutracker.org/",
-            "https://rutracker.net/"
+            "https://rutracker.net/",
+            "https://rutracker.nl/"
         };
         public override string Description => "RuTracker is a Semi-Private Russian torrent site with a thriving file-sharing community";
         public override string Language => "ru-RU";