prepare release 13 (#623)

* update changelog

CHANGELOG.md

@@ -1,22 +1,26 @@
 ## Upcoming Changes
 
 ## next release
+### Breaking
+### Features
+### Improvements
+### Bugfix
+
+## 13.0.0
+
 ### Breaking
 
 * This release limits the maximum python version to `3.12.3` because of the issue
 [#612](https://github.com/fkie-cad/Logprep/issues/612).
 * Remove `normalizer` processor, as it's functionality was replaced by the `grokker`, `timestamper` and `field_manager` processors
 * Remove `elasticsearch_output` connector to reduce maintenance effort
 
-
 ### Features
 
 * add a helm chart to install logprep in kubernetes based environments
 
 ### Improvements
 
-* a result object was added which is returned by every processor
-  * includes generated extra_data, warnings and errors
 * add documentation about behavior of the `timestamper` on `ISO8601` and `UNIX` time parsing
 * add unit tests for helm chart templates
 * add helm to github actions runner