Updated changelog

com.unity.render-pipelines.lightweight/CHANGELOG.md

 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Occlusion strength not being applied on LW standard shaders
+- CopyDepth pass is being called even when a depth from prepass is available
+- GLES2 shader compiler error in IntegrationTests
+- Can't set RenderScale and ShadowDistance by script
 
 ## [2.0.1-preview]