message: Adding mesh-trimmer to CHANGELOG
diff: @@ -121,6 +121,10 @@ New and updated examples and miniapps
  - Added a new test problem in example 24/24p, demonstrating a mixed bilinear
  form for H(div) and L_2, with partial assembly support.
  +- Added a simple mesh editing miniapp, mesh-trimmer, which trims away portions
  + of a mesh based on element attributes. Any newly exposed boundary elements
  + are assigned attribute numbers related to the trimmed element attributes.
  +
  Improved testing
  ----------------
  - Added a GitLab pipeline that automates PR testing on supercomputing systems
  