chore: update NEWS.md with changes to support new loo_compare output structure

Author: Florence Bockting

NEWS.md

@@ -1,7 +1,11 @@
 # BayesERtools 0.2.5 (in development)
 
 ## Major changes
-  
+
+* Updated compatibility with upcoming changes to `loo_compare()` output
+  structure in the `loo` package (> 2.9.0), which now returns a data frame
+  instead of a matrix and includes additional diagnostic columns.
+
 ## Minor changes
 
 * Allow manual breaks in `plot_er()` to control the position of the probability