adding changelog entry for
@@ -17,6 +17,7 @@ Release Data: TBD
* Namespace variables for the Market class [#765](https://github.com/econ-ark/HARK/pull/765)
* We now have a Numba based implementation of PerfForesightConsumerType model available as PerfForesightConsumerTypeFast [#774](https://github.com/econ-ark/HARK/pull/774)
* Namespace for exogenous shocks [#803](https://github.com/econ-ark/HARK/pull/803)
+* State and poststate attributes replaced with state_now and state_prev namespaces [#836](https://github.com/econ-ark/HARK/pull/836)
#### Minor Changes
