Bump version to 0.4.2 for release (#8)

Author: san-tekart

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "tsignal"
-version = "0.4.1"
+version = "0.4.2"
 description = "A Python Signal-Slot library inspired by Qt"
 readme = "README.md"
 requires-python = ">=3.10"