chore: bump to v0.4.0 (#206)

Signed-off-by: ktro2828 <[email protected]>

Author: ktro2828

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "t4-devkit"
-version = "0.3.0"
+version = "0.4.0"
 description = "A toolkit to load and operate T4 dataset."
 authors = [{ name = "Kotaro Uetake", email = "[email protected]" }]
 readme = "README.md"