New: Added HD4Free.xyz to Torznab presets since that site now supports it.

src/NzbDrone.Core/Indexers/Torznab/Torznab.cs

@@ -41,6 +41,7 @@ namespace NzbDrone.Core.Indexers.Torznab
             get
             {
                 yield return GetDefinition("HDAccess.net", GetSettings("http://hdaccess.net"));
+                yield return GetDefinition("HD4Free.xyz", GetSettings("http://hd4free.xyz"));
             }
         }
 

src/NzbDrone.Core/Indexers/Torznab/TorznabSettings.cs

@@ -15,6 +15,7 @@ namespace NzbDrone.Core.Indexers.Torznab
         private static readonly string[] ApiKeyWhiteList =
         {
             "hdaccess.net",
+            "hd4free.xyz",
         };
 
         private static bool ShouldHaveApiKey(TorznabSettings settings)