fix wrong version format

Author: sinisaos

setup.py

@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="piccolo_cursor_pagination",
-    version="0.2,0",
+    version="0.2.1",
     author="sinisaos",
     author_email="[email protected]",
     description="Cursor pagination for Piccolo ORM",