docs: changelog update for 2.8.1 (#3416)

* docs: changelog update for 2.8.1

* chore: add one more entry

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@ -10,11 +10,49 @@ Starting with version 1.8.0, pybind11 releases use a `semantic versioning
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
usage of CPython internal API, and will be removed soon. Use
``py::module_::import("types").attr("SimpleNamespace")``.
`#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)
--------------------