Merge pull request #663 from dbekaert/Changelog

Update CHANGELOG.md

Author: jlmaurer

CHANGELOG.md

@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [PEP 440](https://www.python.org/dev/peps/pep-0440/)
 and uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.5.2]
 ### Changed
 * [627](https://github.com/dbekaert/RAiDER/pull/627) - Made Python datetimes timezone-aware and added unit tests and bug fixes.
 * [651](https://github.com/dbekaert/RAiDER/pull/651) - Removed use of deprecated argument to `pandas.read_csv`.