add note about lang instead of options

README.md

@@ -83,7 +83,7 @@ You can [head to the docs](#docs) for a full treatment of the API.
 ## Tesseract.recognize(image: [ImageLike](#imagelike)[, options]) -> [TesseractJob](#tesseractjob)
 Figures out what words are in `image`, where the words are in `image`, etc.
 - `image` is any [ImageLike](#imagelike) object.
-- `options` is an optional flat json object. `options` may:
+- `options` is either absent, a string specifing a language short code from the [language list](./tesseract_lang_list.md), or a flat json object that may:
     + include properties that override some subset of the [default tesseract parameters](./tesseract_parameters.md)
     + include a `lang` property with a value from the [list of lang parameters](./tesseract_lang_list.md)