Update CHANGELOG.md to explain that recent changes are not here (#944)

* Update CHANGELOG.md to explain that recent changes are not here

---------

Co-authored-by: Will Power <[email protected]>

Author: jezmck

CHANGELOG.md

@@ -1,4 +1,8 @@
-## v13.0.0
+## Note that changelogs not listed here are included in the [releases](https://github.com/owen-it/laravel-auditing/releases).
+
+---
+
+## v13.0.0 (2022-03-02)
 
 ### Added