Fix README description

- Exclude not supported features for now

README.md

@@ -4,11 +4,12 @@ gostfix is simple go-based mail-manager for postfix with web interface
 
 Supported features:
 
-- Web admin interface
+- ~Web admin interface~
 - Web mail interface
-- gRPC admin interface
-- POP3 inteface
-- IMAP interface
+- ~gRPC admin interface~
+- ~POP3 inteface~
+- ~IMAP interface~
+- SASL authentication
 
 # Nginx