Add 1.7.0 changelog entry

Author: adamgraham

CHANGELOG.md

@@ -5,6 +5,19 @@ 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).
 
+## [1.7.0] - WIP
+
+### Added
+
+- Implemented an update strategy pattern to reduce overhead and improve performance
+- New `SmoothDampQuaternion` data structure
+- New `Processors` internal helper class
+
+### Changed
+
+- Moved animation behaviors to a new directory
+- Changed `SmoothDamp<T>` fields from protected to private
+
 ## [1.6.2] - 2021/11/14
 
 ### Changed