add note about ggplotly() now returning different title attributes

Author: cpsievert

NEWS.md

@@ -32,6 +32,7 @@
 
 * The 'collaborate' button no longer appears in the modebar, and as a result, the `config()` function no longer has a `collaborate` argument.
 * Since plotly.js now defaults to *not* showing the "Edit in Chart Studio" button, the `cloud` argument in `config()` was removed. If you want to show this button, use the new plotly.js `showSendToCloud` config attribute instead (e.g. `config(plot_ly(), showSendToCloud = TRUE)`)
+* `ggplotly()` now translates title information to `layout.title.text` (instead of `layout.title`) and `layout.title.font` (instead of `layout.titlefont`)
 
 ## BUG FIXES