message: Updating examples supported in CHANGELOG.
diff: Version 4.2.1 (development)
  ===========================
  -- Added support for some examples (ex1p, ex2p, ex3p, ex4p, ex7p, ex13p) to use
  - hypre built with CUDA and unified memory, when MFEM is build with `make pcuda`
  - and run with `-d cuda:uvm` as a command-line option.
  +- Added support for some examples (ex1p, ex2p, ex7p) to use hypre built with
  + CUDA and unified memory, when MFEM is built with `make pcuda` and run with
  + `-d cuda:uvm` as a command-line option.
  - Added matrix-free GPU-enabled implementations of GradientInterpolator and
  IdentityInterpolator.
  