Update version to 0.4.2.dev1

Author: cdce8p

setup.cfg

@@ -1,7 +1,7 @@
 [metadata]
 name = python-typing-update
 # Version template: x.x.x[.dev1]
-version = 0.4.1
+version = 0.4.2.dev1
 author = Marc Mueller
 description = Update Python typing syntax
 long_description = file:README.md