v1.0

- `maybe_placeholders` is now True by default

- `use_accepts` in `UnexpectedInput.match_examples()` is now True by default

- Token priority is now 0 by default

- `v_args(meta=True)` now gives meta as the first argument. i.e. `(meta, children)`

- Renamed TraditionalLexer to BasicLexer, and 'standard' lexer option to 'basic'