message: Added a note about LOBPCG subspace projector in CHANGELOG.
diff: @@ -19,6 +19,10 @@ Development version, not released yet
  - Add a block lower triangular preconditioner in using a matrix-free
  implementation, see class BlockLowerTriangularPreconditioner.
  +- Added an optional operator in LOBPCG to projects vectors onto a desired
  + subspace (e.g. divergence-free). Other small changes in LOBPCG include the
  + ability to set the starting vectors and support for relative tolerance.
  +
  Version 3.3, released on Jan 28, 2017
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