docs(CHANGELOG): update CHANGELOG.md

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Add Python implementation of accelerated OP and pure-Python wheels by [@XuehaiPan](https://github.com/XuehaiPan) in [#67](https://github.com/metaopt/torchopt/pull/67).
 - Add `nan_to_num` hook and gradient transformation by [@XuehaiPan](https://github.com/XuehaiPan) in [#119](https://github.com/metaopt/torchopt/pull/119).
 - Add matrix inversion linear solver with neumann series approximation by [@Benjamin-eecs](https://github.com/Benjamin-eecs) and [@XuehaiPan](https://github.com/XuehaiPan) in [#98](https://github.com/metaopt/torchopt/pull/98).
 - Add if condition of number of threads for CPU OPs by [@JieRen98](https://github.com/JieRen98) in [#105](https://github.com/metaopt/torchopt/pull/105).