update news

Author: cpsievert

NEWS.md

@@ -12,6 +12,8 @@
 * The `style()` function now supports "partial updates" (i.e. modification of a particular property of an object, rather than the entire object). For example, notice how the first plot retains the original marker shape (a square): `p <- plot_ly(x = 1:10, y = 1:10, symbol = I(15)); subplot(style(p, marker.color = "red"), style(p, marker = list(color = "red")))` (#1342).
 * **plotly** objects can now be serialized and unserialized in different environments (i.e., you can now use `saveRDS()` to save an object as an rds file and restore it on another machine with `readRDS()`). Note this object is *dynamically* linked to JavaScript libraries, so one should take care to use consistent versions of **plotly** when serializing and unserializing (#1376).
 * The `plotly_example()` will now attempt to open the source file(s) used to run the example. Set `edit = FALSE` to prevent the source file(s) from opening.
+* The `event_data()` function now relays the (official plotly.js) `customdata` attribute in similar fashion to (unofficial) `key` attribute (#1423).
+
 
 ## BUG FIXES