Update README.md

edizor · web-flow · commit c9ceba772d19 · 2022-12-08T15:43:38.000+08:00
[skip ci]
diff --git a/core-java-modules/core-java-collections-4/README.md b/core-java-modules/core-java-collections-4/README.md
@@ -13,3 +13,4 @@
 - [Difference Between Java Enumeration and Iterator](https://www.baeldung.com/java-enumeration-vs-iterator)
 - [Sort Collection of Objects by Multiple Fields in Java](https://www.baeldung.com/java-sort-collection-multiple-fields)
 - [Guide to Java PriorityQueue](https://www.baeldung.com/java-priorityqueue)
+- [Java Generics PECS &ndash; Producer Extends Consumer Super](https://www.baeldung.com/java-generics-pecs)
