Changelog entry for #9668

(cherry picked from commit a07d61a)

Author: pabzm

CHANGELOG.md

@@ -8,6 +8,7 @@
 - Fix current script state after initial scripts creation in managesieve_kolab_master mode
 - Fix rcube_imap::get_vendor() result (and PHP warning) on Zimbra server (#9650)
 - Fix regression causing inline SVG images to be missing in mail preview (#9644)
+- Fix plugin "virtuser_file" to handle backward slashes in username (#9668)
 
 ## Release 1.6.9