chore: bump plugin version to v0.4.0

Author: wu-vincent

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "endstone-example"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = []
 authors = [
     { name = "Endstone Developers", email = "hello@endstone.dev" },