updating default changelog

CHANGELOG.md

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+# Changelog
+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]
+### Added
+- 
+
+### Changed
+- 
+
+### Removed
+- 
+
+
+## [1.0.0] - 20XX-01-01
+### Added
+- 
+
+### Changed
+- 
+
+### Removed
+-