Added the new settings to WHATS_NEW.md

Author: thirsch

WHATS_NEW.md

@@ -165,7 +165,8 @@ This allow you to remove all stylesheets and/or all javascripts added into the g
 Configuration
 -------------
 
-A new configuration `sf_upload_dir_name` contains 'uploads' has been added.
+* A new configuration `sf_upload_dir_name` contains 'uploads' has been added.
+* A new settings `sf_display_errors` has been added to change display_errors from stdout to stderr for example.
 
 Performance
 -----------
@@ -244,4 +245,4 @@ all:
     monolog.handler.file:
       class: Monolog\Handler\StreamHandler
       arguments: [/the/file/path/of/your/file.log]
-```
+```