Finalize changelog for 1.39.3 (#2265)

Author: jstone-lucasfilm

CHANGELOG.md

@@ -1,24 +1,29 @@
 # Change Log
 
-## [1.39.3] - Release Candidate
+## [1.39.3] - 2025-03-07
 
 ### Added
-- Added support for the [fract node](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2169), including both new specification language and data library implementations.
+- Added support for the [fract node](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2169), with implementations in GLSL, OSL, and MDL.
+- Added a bitangent input to the [bump node](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2196), aligning its feature set with the normalmap node.
 - Added support for [OSL 1.14](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2204) in shader generation, leveraging the latest closures when available.
 - Added support for [MDL 1.10](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2214) in shader generation, leveraging the latest closures when available.
 - Added initial support for [data library builds](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2226), allowing future releases to generate derived artifacts from the MaterialX data libraries.
 - Added an [ElementVec type alias](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2231) in MaterialX C++, allowing certain patterns to be expressed more clearly and concisely. 
 
 ### Changed
-- Raised the minimum CMake version to [CMake 3.26](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2235).
+- Improved the compatibility of MaterialX shader generation with [Hydra Storm](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2211).
 - Refactored the [type system](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2176) in shader generation, improving the thread-safety and robustness of the generation process.
 - Improved the implementations of the [BSDF operator nodes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2191), preferring data definitions over explicit C++ code.
-- Improved the implementation of the [time node](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2192), using a node graph implementation in hardware shading languages.
+- Improved the implementations of the [time node](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2192), using a graph definition in hardware shading languages.
+- Optimized [GitHub CI](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2253) to reduce build times for contributors.
+- Raised the minimum CMake version to [CMake 3.26](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2235).
 
 ### Fixed
+- Fixed two edge cases in the [version](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2248) [upgrade](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2251) logic for normalmap nodes, addressing the usage of MaterialX versioning in OpenUSD.
+- Fixed [tangent frame orthogonalization](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2245) for the normalmap node in OSL shader generation.
 - Added validation of [tree depth](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2232) and [XInclude depth](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2233) in XML parsing, addressing cases where unusually complex documents could trigger a stack overflow.
-- Adding missing [null](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2228) [checks](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2229) in the getShaderNodes helper function.
-- Fixed edge cases in the version upgrade process for [normalmap](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2248) [nodes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2251).
+- Adding two missing [null](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2228) [checks](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2229) in the getShaderNodes helper function.
+- Integrated fixes to [OSL type classes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2200) from recent work in the OSL project.
 - Improved the handling of [invalid materials](https://github.com/AcademySoftwareFoundation/MaterialX/pull/2230) in the MaterialX Viewer, addressing cases where missing lights could trigger a crash.
 
 ## [1.39.2] - 2025-01-20