Update readme.md

lib/SearchAndSort/readme.md

@@ -102,6 +102,8 @@ onCloseNewRecord | func | Callback for when the new record layer is closed
 onComponentWillUnmount | func | Exposes React `componentWillUnmount`. Called with all of this component's props
 onResetAll | func | Callback for when all filters/search is reset/cleared
 resultsOnNeedMore | func | Custom data-fetching function, triggered when getting near the end of the fetched data. Void return, accepts an object with `records`, `source`, `direction`, `index`, `firstIndex`, and `askAmount`
+showSingleResult | boolean | Whether to auto-show the details record when a search returns a single row
+validateSearchOnSubmit | func | Validates the search query (passed as a parameter) before submission. Submission will be prevented if this returns false.
 
 See ui-users' top-level component [`<Users.js>`](https://github.com/folio-org/ui-users/blob/master/Users.js) for an example of how to use `<SearchAndSort>`.