Fix build warnings

Author: RussKie

Git.hub/RestClientExtensions.cs

@@ -21,7 +21,9 @@ public static List<T> GetList<T>(this IRestClient client, IRestRequest request)
 
                 result.AddRange(pageResponse.Data);
 
+#pragma warning disable CS0618 // Type or member is obsolete
                 Parameter linkHeader = pageResponse.Headers.FirstOrDefault(i => string.Equals(i.Name, "Link", StringComparison.OrdinalIgnoreCase));
+#pragma warning restore CS0618 // Type or member is obsolete
                 if (linkHeader == null)
                     break;