Update README.md

Author: azu

README.md

@@ -31,7 +31,7 @@ Several options can be set in `book.json` to customize the plugin.
 | `edit` | `{true,false}` | [allow edit code](https://github.com/ymcatar/gitbook-plugin-ace/blob/master/README.md) (**ace template required**) |
 | `check` | `{true,false}` | [syntax validation](https://github.com/ymcatar/gitbook-plugin-ace/blob/master/README.md) (**ace template required**) |
 | `theme` | `{monokai,coffee,...}` | [check syntax](https://github.com/ymcatar/gitbook-plugin-ace/blob/master/README.md) (**ace template required**) |
-| `fixlang` | {true,false} | fix some errors with code lang (e.g C++, ...) |
+| `fixlang` | `{true,false}` | fix some errors with code lang (e.g C++, ...) |
 
 Just add the desired optin under `pluginConfig` in the `book.json` file