Tweak version number

Author: rafalp

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "ariadne"
-version = "0.18.0rc1"
+version = "0.18.0.rc1"
 description = "Ariadne is a Python library for implementing GraphQL servers."
 authors = [{ name = "Mirumee Software", email = "[email protected]" }]
 readme = "README.md"