notification: added news

doc/news/_preparation_next_release.md

@@ -71,7 +71,12 @@ We added even more functionality, which could not make it to the highlights:
   has been added.
   It can be used to integrate the notification feature with applications based
   on glib.
-
+- The
+  [notification API](https://doc.libelektra.org/api/current/html/group__kdbnotification.html)
+  was extended.
+  The API now supports contexts for callbacks, the types `int`, `unsigned int`,
+  `long`, `unsigned long`, `float` and `double`.
+  It also supports all of Elektra's `kdb_*_t` types defined in `kdbtypes.h`.
 
 ## Documentation