Update AutoMappingTests.cs

Author: mythz

tests/ServiceStack.Text.Tests/AutoMappingTests.cs

@@ -599,7 +599,7 @@ public void Does_convert_models_with_collections()
             Assert.That(MatchesUsers(array, from.Collection.ConvertTo<User[]>()));
             Assert.That(MatchesUsers(array, from.Collection.ConvertTo<HashSet<User>>()));
 
-            var hashset = from.Collection.ToHashSet();
+            var hashset = from.Collection.ToSet();
             Assert.That(MatchesUsers(hashset, from.Collection.ConvertTo<IEnumerable<User>>()));
             Assert.That(MatchesUsers(hashset, from.Collection.ConvertTo<List<User>>()));
             Assert.That(MatchesUsers(hashset, from.Collection.ConvertTo<User[]>()));