message: Update readme with nvhpc and cray support
diff: @@ -42,10 +42,12 @@ For Ginkgo core library:
  * _clang 3.9+_
  * _Intel compiler 2018+_
  * _Apple LLVM 8.0+_
  + * _Cray Compiler 14.0.1+_
  + * _NVHPC Compiler 22.7+_
  The Ginkgo CUDA module has the following __additional__ requirements:
  -* _CUDA 9.2+_
  +* _CUDA 9.2+_ or _NVHPC Package 22.7+_
  * Any host compiler restrictions your version of CUDA may impose also apply
  here. For the newest CUDA version, this information can be found in the
  [CUDA installation guide for Linux](https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html)
  