Fix typo in unparsing of a class definition.
diff --git a/Demo/parser/unparse.py b/Demo/parser/unparse.py
index 048f8ca..6e4ef63 100644
--- a/Demo/parser/unparse.py
+++ b/Demo/parser/unparse.py
@@ -215,7 +215,7 @@
         if t.kwargs:
             if comma: self.write(", ")
             else: comma = True
-            self.write("*")
+            self.write("**")
             self.dispatch(t.kwargs)
         self.write(")")