update todo

TODO.md

@@ -1,15 +1,11 @@
 # meta.hpp
 
-- add dtors
-- add meta exception class;
-- void value?
-- all string to hash?
-
 * argument names
-* argument defaults
-* type conversions
+* exception class
+* move-only value type support
 * states and types metadata
+* type conversions
 
-? add type names;
-? add enum_type::create, number_type::create, and so on.
-? add invoke and is_invocable_with by dynamic types
+- (?) type names
+- (?) argument defaults
+- (?) enum_type::create, number_type::create, and so on