chore(main): release 0.4.0

Author: a2a-bot

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.4.0](https://github.com/a2aproject/a2a-python/compare/v0.3.25...v0.4.0) (2026-04-07)
+
+
+### Features
+
+* Add support for more Task Message and Artifact fields in the Vertex Task Store ([#908](https://github.com/a2aproject/a2a-python/issues/908)) ([5e0dcd7](https://github.com/a2aproject/a2a-python/commit/5e0dcd798fcba16a8092b0b4c2d3d8026ca287de)), closes [#751](https://github.com/a2aproject/a2a-python/issues/751)
+
 ## [0.3.25](https://github.com/a2aproject/a2a-python/compare/v0.3.24...v0.3.25) (2026-03-10)