Update HttpAccept.Rss to include application/xml

src/NzbDrone.Common/Http/HttpAccept.cs

@@ -4,7 +4,7 @@ namespace NzbDrone.Common.Http
 {
     public sealed class HttpAccept
     {
-        public static readonly HttpAccept Rss = new HttpAccept("application/rss+xml, text/rss+xml, text/xml");
+        public static readonly HttpAccept Rss = new HttpAccept("application/rss+xml, text/rss+xml, application/xml, text/xml");
         public static readonly HttpAccept Json = new HttpAccept("application/json");
         public static readonly HttpAccept Html = new HttpAccept("text/html");