update news

Author: cpsievert

NEWS.md

@@ -4,6 +4,10 @@
 
 * This version of the R package upgrades the version of the underlying plotly.js library from v1.46.1 to v1.49.4. The [plotly.js release page](https://github.com/plotly/plotly.js/releases) has the full list of changes.
 
+## IMPROVEMENTS
+
+* `event_data()` gains support for the `plotly_sunburstclick` event (#1648)
+
 ## BUG FIXES
 
 * Fixed an issue with correctly capturing the return value of user-expressions to `renderPlotly()` (#1528).