chore: Update README with the documentation for keepBoundarySelected

packages/react-calendar/README.md

@@ -111,6 +111,7 @@ Displays a complete, interactive calendar.
 | formatYear              | Function called to override default formatting of year in the top navigation section. Can be used to use your own formatting function.                                                                                                                                                                                                                                                                                     | (default formatter)                                   | `(locale, date) => formatDate(date, 'YYYY')`                                                                                                                                                                                                                                 |
 | goToRangeStartOnSelect  | Whether to go to the beginning of the range when selecting the end of the range.                                                                                                                                                                                                                                                                                                                                           | `true`                                                | `false`                                                                                                                                                                                                                                                                      |
 | inputRef                | A prop that behaves like [ref](https://reactjs.org/docs/refs-and-the-dom.html), but it's passed to main `<div>` rendered by `<Calendar>` component.                                                                                                                                                                                                                                                                        | n/a                                                   | <ul><li>Function:<br />`(ref) => { this.myCalendar = ref; }`</li><li>Ref created using `createRef`:<br />`this.ref = createRef();`<br />…<br />`inputRef={this.ref}`</li><li>Ref created using `useRef`:<br />`const ref = useRef();`<br />…<br />`inputRef={ref}`</li></ul> |
+| keepBoundarySelected    | Whether the range should remain selected if the user clicks on one of the "range boundaries". For instance, if the user selects days 1 and 3, and subsequently clicks on day 3 again, day 1 will remain selected to "update" the range.                                                                                                                                                                                    | `false`                                               | `true`                                                                                                                                                                                                                                                                       |
 | locale                  | Locale that should be used by the calendar. Can be any [IETF language tag](https://en.wikipedia.org/wiki/IETF_language_tag). **Note**: When using SSR, setting this prop may help resolving hydration errors caused by locale mismatch between server and client.                                                                                                                                                          | Server locale/User's browser settings                 | `"hu-HU"`                                                                                                                                                                                                                                                                    |
 | maxDate                 | Maximum date that the user can select. Periods partially overlapped by maxDate will also be selectable, although react-calendar will ensure that no later date is selected.                                                                                                                                                                                                                                                | n/a                                                   | Date: `new Date()`                                                                                                                                                                                                                                                           |
 | maxDetail               | The most detailed view that the user shall see. View defined here also becomes the one on which clicking an item will select a date and pass it to onChange. Can be `"month"`, `"year"`, `"decade"` or `"century"`.                                                                                                                                                                                                        | `"month"`                                             | `"year"`                                                                                                                                                                                                                                                                     |