Document 5.3.0.0 API changes

Author: kontura

doc/api/changes_dnf5.3.rst

@@ -0,0 +1,17 @@
+###############################################
+ Modifications to the public API in dnf 5.3.0.0
+###############################################
+
+This page lists the differences in the public API of `DNF5 5.3 <https://github.com/rpm-software-management/dnf5/releases/tag/5.3.0.0>`_ compared to the previous major version, `DNF5 5.2 <https://github.com/rpm-software-management/dnf5/releases/tag/5.2.0.0>`_.
+
+ABI change of libdnf5-cli
+=========================
+
+New version is ``libdnf5-cli.so.3`` and users of libdnf5-cli will need to be recompiled.
+
+
+Advisory command json output
+============================
+
+* Changed timestamps from ISO strings to UNIX integers.
+* ``advisory info`` subcommand previously outputted a dictionary where each advisory json was indexed by its name, this was changed to an array.

doc/api/index.rst

@@ -9,4 +9,5 @@ API Reference
     python/python
     c++/cpp
     changes_dnf5.2
+    changes_dnf5.3
     deprecations