Update changelog

CHANGELOG.rst

@@ -6,6 +6,15 @@ All notable changes to this project will be documented in this file.
 The format is based on `Keep a Changelog`_,
 and this project adheres to `Semantic Versioning`_.
 
+`3.1.5`_ - 2023-09-02
+---------------------
+
+Fixed
+~~~~~
+
+* [Docs] A required package was not listed
+* Migrations failed in some cases
+
 `3.1.4`_ - 2023-07-20
 ---------------------