fix incorrect version

d1d903d incorrectly nly incremented the minor version without resetting the patch

Author: Cube707

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "readchar"
-version = "4.2.1-dev0"
+version = "4.2.0-dev1"
 requires-python = ">= 3.8"
 dependencies = []
 authors = [