version history update

Change-Id: Ia92caeb0f6659667ce1e56eefd0e3c87b3f6e538

docs/source/version_history.rst

@@ -74,9 +74,6 @@ New Features
 
 #. New, much improved HTML documentation using Sphinx.
 
-#. Speedup the robust loss function correction logic when residual is
-   one dimensional.
-
 #. Changed ``NumericDiffCostFunction`` to take functors like
    ``AutoDiffCostFunction``.
 
@@ -84,6 +81,15 @@ New Features
    differentiation. This is done by adding ``CostFunctionToFunctor``
    and ``NumericDiffFunctor`` objects to the API.
 
+#. Sped up the robust loss function correction logic when residual is
+   one dimensional.
+
+#. Sped up ``DenseQRSolver`` by changing the way dense jacobians are
+   stored. This is a 200-500% improvement in linear solver performance
+   depending on the size of the problem.
+
+#. ``DENSE_SCHUR`` now supports multi-threading.
+
 #. Greatly expanded ``Summary::FullReport``:
 
    - Report the ordering used by the ``LinearSolver``.