Add v0.5.2 entry to CHANGELOG

Author: princemaple

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## v0.5.2 (2026-02-14)
+
+- Add `len/1` ([#86](https://github.com/princemaple/elixir-queue/pull/86))
+
 ## v0.5.0 (2018-09-04)
 
 ### Added