Update changelog

Author: keckler

Diff for: doc/release/0.2.rst

@@ -14,6 +14,7 @@ What's new in ARMI
 #. Downgrading Draft PRs as policy. (`PR#1444 <https://github.com/terrapower/armi/pull/1444>`_)
 #. Attempt to set representative block number densities by component if possible. (`PR#1412 <https://github.com/terrapower/armi/pull/1412>`_)
 #. Use functools to preserve function attributes when wrapping with codeTiming.timed (`PR#1466 <https://github.com/terrapower/armi/pull/1466>`_)
+#. Remove a number of deprecated block, assembly, and core parameters related to a defunct internal plugin
 #. TBD
 
 Bug fixes