Release 0.6.4-rc.1

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -202,7 +202,9 @@ review step.
 
 ## Status
 
-Version 0.6.3 is the current release. It brings the lego docs up to
+Version 0.6.3 is the current release; 0.6.4 is in testing (0.6.4-rc.1):
+failed logins and refused tokens are logged, address first, for Guard
+and fail2ban. 0.6.3 brings the lego docs up to
 lego 5 and explains lego with split DNS. 0.6.2 added a `certificates` role
 for tokens that get certificates for other hosts. 0.6.1 gets certificates onto your
 other hosts (`jarl cert get`: Jarl obtains and renews them, a host downloads them and runs a