[FIX] hm-imap.php PHP NOTICE Deprecated: Creation of dynamic property…

… Hm_IMAP:: is deprecated

modules/imap/hm-imap.php

@@ -143,7 +143,7 @@ class Hm_IMAP extends Hm_IMAP_Cache {
         public $con_error_num = 0;
 
         public $banner = '';
-
+        private $namespace_count = 0;
         /* holds information about the currently selected mailbox */
         public $selected_mailbox = false;