Update changelog.

CHANGES.rst

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 Cython Changelog
 ================
 
+0.29.29 (2022-??-??)
+====================
+
+Bugs fixed
+----------
+
+* Function definitions in ``finally:`` clauses were not correctly generated.
+  Patch by David Woods.  (Github issue #4651)
+
+* A case where C-API functions could be called with a live exception set was fixed.
+  Patch by Jakub Kulík.  (Github issue #4722)
+
+* Pickles can now be exchanged again with those generated from Cython 3.0 modules.
+  (Github issue #4680)
+
+* The C union type in pure Python mode mishandled some field names.
+  Patch by Jordan Brière.  (Github issue #4727)
+
+* Allow users to overwrite the C macro ``_USE_MATH_DEFINES``.
+  Patch by Yuriy Chernyshov. (Github issue #4690)
+
+* Improved compatibility with CPython 3.10/11.
+  Patches by Thomas Caswell, David Woods.  (Github issues #4609, #4667, #4721, #4730)
+
+* Docstrings of descriptors are now provided in PyPy 7.3.9.
+  Patch by Matti Picus.  (Github issue #4701)
+
+
 0.29.28 (2022-02-17)
 ====================