add disclaimer and todo

README.md

@@ -5,6 +5,16 @@
 
 # parce
 
+> IN PROGRESS, not ready for real use.
+>
+> todo:
+> - [ ] #1
+> - [ ] remove dependencies generated by macros (if possible)
+> - [ ] use the same algorithm for lexer and parser
+> - [ ] optimize for speeeed
+> - [ ] semantic predicates
+>   - [ ] left-recursive grammar rewriting
+
 Parce is a parser and lexer generator, where the grammar and the parse tree are the same
 data structure. It is similar to ANTLR, but the grammar is written in Rust code, not a
 special DSL.
@@ -28,15 +38,6 @@ special DSL.
 - Modal lexers
     - unlike ANTLR, lexemes can be active in multiple modes
 
-### Parser Features
-
-## Future plans
-
-- Semantic predicates
-    - left-recursive grammar re-writing like ANTLR, using semantic predicates
-- Data post-processors
-- multi-threaded lexing and parsing.
-
 ## Contributing
 
 If you find a bug or want a new feature, please create an issue or pull request on [GitHub](https://github.com/JoelCourtney/parce)!