DOC: Update changelog for release

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased] ##
+## [0.15.0] - 2024-07-09 ##
 
 ### Added ###
 
@@ -21,8 +21,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * Using environment variable PYLINKAHEADINI instead of PYCAOSDBINI.
 
-### Deprecated ###
-
 ### Removed ###
 
 * Support for Python 3.7
@@ -37,8 +35,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * [#120](https://gitlab.com/linkahead/linkahead-pylib/-/issues/120) Unwanted
   subproperties in reference properties.
 
-### Security ###
-
 ### Documentation ###
 
 * Added documentation and a tutorial example for the usage of the `page_length`