Update 'TODO.md'

TODO

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-# Todos
-
-- Create feature flag for the parse mdule
-- better error handling in the parser
-- Implement checks for existing trait storage files
-- Write unit tests

TODO.md

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+# Todos
+
+- Create feature flag for the parse mdule.
+- Better error handling in the parser. (dont panic on every wrong token!)
+- Implement checks for existing trait storage files.
+- Write more unit tests.
+- Create macro that implements traits on objects by shelling out to other binaries using sing.
+- Investigate whether it's possible to make the `sing_add_trait` macro work without an impl block