maddy 0.9.4

== Minor additions

* smtp: add LOGIN SASL auth directive (thanks Sean van Osnabrugge!)

== Bug fixes

* log: Refactor to define proper loggers tree

  This in turn should fix numerous inconsistencies in how
  logger is configured.

* Fixed limiters group configuration (thanks Denis Girko!)

  Per-destination limits are now initialized correctly and work.

* storage/imapsql: Upgrade go-imap-sql to fix SQLITE_BUSY issues
  
  This will fix a lot of "database is locked" errors for imapsql use
  with SQLite.

* storage/imapsql: Fix handling of serialization errors

  If "database is locked" still happens, clients will receive proper
  temporary error codes instead of 5xx.