chore(main): release 0.4.0

Author: a2a-bot

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.4.0](https://github.com/a2aproject/a2a-python/compare/v0.3.8...v0.4.0) (2025-10-09)
+
+
+### Features
+
+* custom ID generators ([#490](https://github.com/a2aproject/a2a-python/issues/490)) ([051ab20](https://github.com/a2aproject/a2a-python/commit/051ab20c395daa2807b0233cf1c53493e41b60c2))
+
+
+### Documentation
+
+* Fix Docstring formatting for code samples ([#492](https://github.com/a2aproject/a2a-python/issues/492)) ([dca66c3](https://github.com/a2aproject/a2a-python/commit/dca66c3100a2b9701a1c8b65ad6853769eefd511))
+
 ## [0.3.8](https://github.com/a2aproject/a2a-python/compare/v0.3.7...v0.3.8) (2025-10-06)