add bullet

Author: teunbrand

NEWS.md

@@ -1,5 +1,6 @@
 # ggplot2 (development version)
 
+* Layers can have names (@teunbrand, #4066).
 * (internal) The plot's layout now has a coord parameter that is used to 
   prevent setting up identical panel parameters (#5427)
 * (internal) rearranged the code of `Facet$draw_panels()` method (@teunbrand).