message: Improve CHANGELOG entry for matrix-free AMS.
diff: @@ -12,7 +12,8 @@ Version 4.2.1 (development)
  ===========================
  - Added high-order matrix-free auxiliary Maxwell solver for H(curl) problems,
  - as described in Barker and Kolev 2020 (https://doi.org/10.1002/nla.2348).
  + as described in Barker and Kolev 2020 (https://doi.org/10.1002/nla.2348). See
  + Example 3p and linalg/auxiliary.?pp.
  - Added a new miniapp block-solvers that compares the performance of various
  solvers for mixed finite element discretization of the second order scalar
  