doc: update CHANGES.rst

CHANGES.rst

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 .. |Changes|
+Version `v0.8.3 <https://github.com/autumnjolitz/instruct/releases/tag/v0.8.3>`_
+----------------------------------------------------------------------------------
+
+Released 2024-07-30
+
+`Compare with v0.8.2 <https://github.com/autumnjolitz/instruct/compare/v0.8.2...v0.8.3>`_ (12 commits since)
+
+Bug Fixes
+
+- correct subtype generation for 3.10+ ``types.UnionType``s (`50a7439 <https://github.com/autumnjolitz/instruct/commit/50a74390e57449e32d9c72eef901f0e8982d651d>`_ by Autumn).
+- add ``mode`` to benchmarking, refactor slightly (`1e0e821 <https://github.com/autumnjolitz/instruct/commit/1e0e8216ceb88905224c5370dd52a6622aa58eb8>`_ by Autumn).
+- ``fast=True`` now supports all event listener forms (`9bf8489 <https://github.com/autumnjolitz/instruct/commit/9bf84898095d3d2241b94801661811d12dc8ca70>`_ by Autumn).
+- ``__main__`` now can run benchmark again (`67d59fd <https://github.com/autumnjolitz/instruct/commit/67d59fd50e466be46d9d4bd80cb9a5df0af2d0c3>`_ by Autumn).
+
+Other
+
+- feature: implement simple ``type alias = hint`` (3.12+) (`e9e0ac7 <https://github.com/autumnjolitz/instruct/commit/e9e0ac782ae48d5f07bc3a68edaea97bb81af322>`_ by Autumn).
+
 Version v0.8.2
 -------------------