add news bullet

Author: teunbrand

NEWS.md

@@ -1,5 +1,7 @@
 # ggplot2 (development version)
 
+* Better handling of the `guide_axis_logticks(negative.small)` parameter when
+  scale limits have small maximum (@teunbrand, #6121).
 * New `get_labs()` function for retrieving completed plot labels 
   (@teunbrand, #6008).
 * Built-in `theme_*()` functions now have `ink` and `paper` arguments to control