Prepare placeholder for setting the module version

--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ maintainers = ["Ludeeus <ludeeus@ludeeus.dev>"]
 name = "awesomeversion"
 readme = "README.md"
 repository = "https://github.com/ludeeus/awesomeversion"
-version = "0"
+version = "@VERSION@"
 
 [tool.poetry.dependencies]
 python = "^3.7"