Update CHANGELOG.md

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CHANGELOG.md

@@ -6,6 +6,9 @@
 ### Added
 * DORiE now depends on [`yaml-cpp`](https://github.com/jbeder/yaml-cpp/), a
     library for reading YAML files. The version required is >=5.2.0.
+* New classes representing parameterizations. Every parameterization must now
+    derive from `RichardsParameterization`, and return function objects
+    representing parameterization functions.
 
 ### Changed
 * `Simulation` is renamed `RichardsSimulation` and moved to 
@@ -13,6 +16,24 @@
 * `RichardsSimulation` now has its own `RichardsSimulationTraits` derived from
     `BaseTraits`, which defines all its member types. `BaseTraits` now have
     reduced content and are intended to be shared between models/simulations.
+* Data structures for storing and accessing parameters. The new class
+    `FlowParameters` maps parameter sets and scaling factors to every grid cell
+    on the coarsest grid level, and only stores one set of parameters for
+    each soil layer. Before querying the parameterization functions, users need
+    to call `FlowParameters::bind` with a grid entity to cache the appropriate
+    data. All classes and functions querying parameter data have been updated.
+    
+    The old parameterization classes located in
+    [`param_base.hh`](dune/dorie/solver/param_base.hh),
+    [`param_factory.hh`](dune/dorie/solver/param_factory.hh), and
+    [`param_van_genuchten.hh`](dune/dorie/solver/param_van_genuchten.hh)
+    are still used for reading in data for the new storage scheme.
+    The respective objects are freed once a simulation commences.
+
+### Deprecated
+* The configuration file key `[parameters.interpolation]` is deprecated due to
+    the new scheme for storing parameterization data. DORiE now only supports 
+    nearest-neighbor interpolation of parameters and scaling factors.
 
 
 ## 1.1.1 (2018-08-21)