docs(CHANGES) Note PEP 563 compatibility

Author: tony

CHANGES

@@ -15,6 +15,17 @@ $ pip install --user --upgrade --pre libtmux
 
 <!-- To maintainers and contributors: Please add notes for the forthcoming version above -->
 
+### Development
+
+#### chore: Implement PEP 563 deferred annotation resolution (#555)
+
+- Add `from __future__ import annotations` to defer annotation resolution and reduce unnecessary symbol computations during type checking
+- Enable Ruff checks for PEP-compliant annotations:
+  - [non-pep585-annotation (UP006)](https://docs.astral.sh/ruff/rules/non-pep585-annotation/)
+  - [non-pep604-annotation (UP007)](https://docs.astral.sh/ruff/rules/non-pep604-annotation/)
+
+For more details on PEP 563, see: https://peps.python.org/pep-0563/
+
 ## libtmux 0.40.1 (2024-12-24)
 
 ### Bug fix