Update CHANGELOG.md

Author: gkjohnson

CHANGELOG.md

@@ -15,6 +15,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Specular sampling to use perceptual roughness.
 - Default specular and ior values to match three.js.
 
+### Changed
+- Opacity support now requires setting `material.transparent` to true.
+
 ## [0.0.6] - 2022-08-06
 ### Added
 - Support for sheen parameter support