Updated README.md

added link back to the article: https://www.baeldung.com/jackson-deduction-based-polymorphism

Author: Asjad-J

jackson-modules/jackson-annotations/README.md

@@ -7,3 +7,4 @@ This module contains articles about Jackson annotations.
 - [More Jackson Annotations](https://www.baeldung.com/jackson-advanced-annotations)
 - [Jackson – Bidirectional Relationships](https://www.baeldung.com/jackson-bidirectional-relationships-and-infinite-recursion)
 - [Jackson JSON Views](https://www.baeldung.com/jackson-json-view-annotation)
+- [Deduction-Based Polymorphism in Jackson 2.12](https://www.baeldung.com/jackson-deduction-based-polymorphism)