docs: changelog update for 2.8.1 (#3416)

* docs: changelog update for 2.8.1

* chore: add one more entry

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/changelog.rst

@@ -10,11 +10,49 @@ Starting with version 1.8.0, pybind11 releases use a `semantic versioning
 IN DEVELOPMENT
 IN DEVELOPMENT
 --------------
 --------------
 
 
+v2.8.0 (Oct 27, 2021)
+---------------------
+
+Changes and additions:
+
 * The simple namespace creation shortcut added in 2.8.0 was deprecated due to
 * The simple namespace creation shortcut added in 2.8.0 was deprecated due to
   usage of CPython internal API, and will be removed soon. Use
   usage of CPython internal API, and will be removed soon. Use
   ``py::module_::import("types").attr("SimpleNamespace")``.
   ``py::module_::import("types").attr("SimpleNamespace")``.
   `#3374 <https://github.com/pybinyyd/pybind11/pull/3374>`_
   `#3374 <https://github.com/pybinyyd/pybind11/pull/3374>`_
 
 
+* Add C++ Exception type to throw and catch ``AttributeError``. Useful for
+  defining custom ``__setattr__`` and ``__getattr__`` methods.
+  `#3387 <https://github.com/pybind/pybind11/pull/3387>`_
+
+Fixes:
+
+* Fixed the potential for dangling references when using properties with
+  ``std::optional`` types.
+  `#3376 <https://github.com/pybind/pybind11/pull/3376>`_
+
+* Modernize usage of ``PyCodeObject`` on Python 3.9+ (moving toward support for
+  Python 3.11a1)
+  `#3368 <https://github.com/pybind/pybind11/pull/3368>`_
+
+* A long-standing bug in ``eigen.h`` was fixed (originally PR #3343). The bug
+  was unmasked by newly added ``static_assert``'s in the Eigen 3.4.0 release.
+  `#3352 <https://github.com/pybind/pybind11/pull/3352>`_
+
+* Support multiple raw inclusion of CMake helper files (Conan.io does this for
+  multi-config generators).
+  `#3420 <https://github.com/pybind/pybind11/pull/3420>`_
+
+* Fix harmless warning on upcoming CMake 3.22.
+  `#3368 <https://github.com/pybind/pybind11/pull/3368>`_
+
+* Fix 2.8.0 regression with MSVC 2017 + C++17 mode + Python 3.
+  `#3407 <https://github.com/pybind/pybind11/pull/3407>`_
+
+* Fix 2.8.0 regression that caused undefined behavior (typically
+  segfaults) in ``make_key_iterator``/``make_value_iterator`` if dereferencing
+  the iterator returned a temporary value instead of a reference.
+  `#3348 <https://github.com/pybind/pybind11/pull/3348>`_
+
 
 
 v2.8.0 (Oct 4, 2021)
 v2.8.0 (Oct 4, 2021)
 --------------------
 --------------------