update NEWS with breaking changes

Author: leslie-huang

NEWS

@@ -1,8 +1,11 @@
 leaflet 2.0.3
 --------------------------------------------------------------------------------
 
+BREAKING CHANGES
+* `data("providers")` and `data("providers.details")` no longer exist. Please use `leaflet::providers` and `leaflet::providers.details`. (#636)
+
 BUG FIXES and IMPROVEMENTS
-* Integrated data from `leaflet.providers` package; this breaks `data("providers")` and `data("providers.details")`. See [leaflet.providers](https://leslie-huang.github.io/leaflet.providers/). (#636)
+* Integrated data from `leaflet.providers` package. See [leaflet.providers](https://rstudio.github.io/leaflet.providers/) for details. (#636)
 * Fixed [rstudio/crosstalk#58](https://github.com/rstudio/crosstalk/issues/58), which caused Leaflet maps that used Crosstalk shared data in Shiny apps, to be redrawn at incorrect times.
 * invokeRemote() now resolves html dependencies before passing them to shiny::createWebDependency() (#620).
 * Upgrade leaflet-provider to 1.4.0, enable more map variants such as CartoDB.Voyager (#567)