Add 4.2.0 changelog fragment for community.kubernetes deprecation

4/changelog.yaml

@@ -56,3 +56,13 @@ releases:
 
         `Porting Guide <https://docs.ansible.com/ansible/devel/porting_guides.html>`_'
     release_date: '2021-06-10'
+  4.2.0:
+    changes:
+      deprecated_features:
+        - The community.kubernetes collection is being renamed to kubernetes.core.
+          In Ansible 5, community.kubernetes will be replaced by an empty collection
+          which has deprecated redirects for all the current content to kubernetes.core.
+          If you are using FQCNs starting with ``community.kubernetes.``, please update
+          them to ``kubernetes.core.`` now. Note that kubernetes.core has been included
+          in Ansible since Ansible 3.0.0
+          (https://github.com/ansible-community/community-topics/issues/22).