* **typegoose::getDiscriminatorModelForClass:** add warning when using different "existing*" options ([0599ef2](https://github.com/typegoose/typegoose/commit/0599ef299901e5eb4a47e64fea298a802f25d9c5)), closes [typegoose/typegoose#789](https://github.com/typegoose/typegoose/issues/789)