Add a changelog entry

Author: voodoos

CHANGES.md

@@ -7,6 +7,7 @@ unreleased
     - `locate` can now disambiguate between files with identical names and contents
       (#1882)
     - `occurrences` now reports stale files (#1885)
+    - Fix issues with ident validation and Lid comparison for occurrences (#1924)
   + ocaml-index
     - Improve the granularity of index reading by segmenting the marshalization
       of the involved data-structures. (#1889)