Update NEWS.md for forecast step

NEWS.md

@@ -1,6 +1,38 @@
+# DSGE.jl v0.2.0 Release Notes
+
+## New features
+
+- Added the An-Schorfheide model, a simple three-equation New Keynesian model.
+- Added Model 1010, an updated version of Model 1002.
+- Added three optimization methods: `:simulated_annealing`, `:LBFGS`, and
+  `:combined_optimizer` (which alternates between simulated annealing and
+  LBFGS).
+- Added the `PseudoObservable` type and the `pseudo_measurement` function, which
+  defines pseudo-observables (linear combinations of states which are not
+  observed) for each model, e.g. the output gap.
+- Implemented the forecast step, a suite of functions that forecast using
+  estimated parameters and compute means and bands of the forecasted series. The
+  top-level functions are `forecast_one` and `means_bands_all`; see the
+  [forecasting](http://frbny-dsge.github.io/DSGE.jl/latest/forecast.html) and
+  [means and bands](http://frbny-dsge.github.io/DSGE.jl/latest/means_bands.html)
+  for more details.
+
+## Breaking changes
+
+- Added the `Observable` type; replaced the `data_series` and `data_transforms`
+  fields in the model type definitions with
+  `observable_mappings::OrderedDict{Symbol, Observable}`, which is initialized
+  in `init_observable_mappings!`.
+- `kalman_filter` has been broken out into
+  [StateSpaceRoutines.jl](https://github.com/FRBNY-DSGE/StateSpaceRoutines.jl).
+- `estimate` now saves only parameter draws, not the associated state-space
+  matrices or the last filtered states for each draw.
+
+
 # DSGE.jl v0.1.5 Release Notes
 
 ## New Features
+
 - Added Model 1002, an updated version of Model 990.
 - Added documentation for Model 1002 at docs/DSGE_Model_Documentation_1002.pdf.
   This pdf includes an overview of the economic theory underlying the model, a
@@ -9,16 +41,20 @@
   and more.
 
 ## Deprecation Fixes
+
 - Optim.jl's `MultivariateOptimizationResults` type requires `f_increased` field
 - `MersenneTwister` must be constructed with a seed
 
+
 # DSGE.jl v0.1.4 Release Notes
 
 ## New Features
+
 - Gensys no longer throws an error when system is indeterminate;
   instead, a warning is printed to the screen.
 
 ## Bug Fixes
+
 - Fix `OptimizationTrace` constructor according to Optim v0.6. See #6.