update status of fullcalendar/temporal-polyfill

Author: arshaw

README.md

@@ -63,7 +63,7 @@ A cookbook to help you get started and learn the ins and outs of Temporal is ava
 | Polyfill                                                                         | Repo                                                                                | Status                  |
 | -------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------- | ----------------------- |
 | **[@js-temporal/polyfill](https://www.npmjs.com/package/@js-temporal/polyfill)** | [js-temporal/temporal-polyfill](https://github.com/js-temporal/temporal-polyfill)   | Alpha release available |
-| **[temporal-polyfill](https://www.npmjs.com/package/temporal-polyfill)**         | [fullcalendar/temporal-polyfill](https://github.com/fullcalendar/temporal-polyfill) | Beta release available  |
+| **[temporal-polyfill](https://www.npmjs.com/package/temporal-polyfill)**         | [fullcalendar/temporal-polyfill](https://github.com/fullcalendar/temporal-polyfill) | Stable release available |
 | **[temporal-polyfill-lite](https://www.npmjs.com/package/temporal-polyfill-lite)** | [fabon-f/temporal-polyfill-lite](https://github.com/fabon-f/temporal-polyfill-lite) | Release Candidate available |
 
 If you're working on a polyfill, please file an issue or PR so we can add yours here.