message: CHANGELOG: add one-line description of matrix-free Jacobi PR
diff: @@ -13,6 +13,8 @@ Version 4.0.1 (development)
  Improved GPU support
  --------------------
  +- Added initial support for matrix-free diagonal smoothers on GPUs.
  +
  - Added initial support for AMD GPUs based on HIP: a C++ runtime API and kernel
  language that can run on both AMD and NVIDIA hardware. With this change, the
  list of backends is: "occa-cuda", "raja-cuda", "cuda", "hip", "occa-omp",
  