Add missing changelog for #784.

Author: felixfontein

changelogs/fragments/784-get_certificate-get_certificate_chain.yml

@@ -0,0 +1,4 @@
+minor_changes:
+  - "get_certificate - allow to obtain the certificate chain sent by the server, and the one used for validation, with the new ``get_certificate_chain`` option.
+     Note that this option only works if the module is run with Python 3.10 or newer
+     (https://github.com/ansible-collections/community.crypto/issues/568, https://github.com/ansible-collections/community.crypto/pull/784)."