Update changelog

Author: m-mohr

CHANGELOG.md

@@ -4,6 +4,13 @@ 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).
 
+## [Unreleased]
+
+- Allow the endpoint to be used at any level / for any depth, not just on the landing page
+- Addition of the `parent` relation type
+- Updated examples and (STAC) version numbers
+- Clarifications and chore changes
+
 ## [v1.0.0-rc.2] - 2022-11-01
 
 - No functional changes, only clarifications and chore changes