message: Update CHANGELOG with BR2
diff: @@ -99,6 +99,9 @@ Discretization improvements
  - Added support for interpolation of functions in L2, H(div) and H(curl)
  spaces using GSLIB-FindPoints.
  +- Added support for the "BR2" discontinuous Galerkin discretization for
  + diffusion via DGDiffusionBR2Integrator (see Example 14/14p).
  +
  Linear and nonlinear solvers
  ----------------------------
  - Added power method to iteratively estimate the largest eigenvalue and the
  